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Gallery 10  Agates, Geodes & Thundereggs

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AD-218  Chrome-Chalcedony (Mtorodite)  $60

Mtoroshanga, Makonde District, Mashonaland West, Zimbabwe

8.6 x 2.7 x 3.6 cm

A great example of the rare, chromium-rich variety of Chalcedony that also known as Mtorodite; not to be confused with the nickel-rich, lighter-colored variety of Chalcedony known as Chrysoprase. This specimen has a rich dark-green color that is similar to Jade.


Agate and Quartz, Amerzgane, Ouarzazate Province, Drâa-Tafilalet Region, Morocco
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AD-168  Agate with Quartz  $45

Amerzgane, Ouarzazate Province, Drâa-Tafilalet Region, Morocco

9.7 x 5.2 x 4.4 cm

This is an example of one of the more colorful combinations of Agate & Quartz from Amerzgane. Bands of red and peach-colored Agate surround a center lined with crystals of Quartz. Most of the Agates that I have seen from this location have a milky-colored Chalcedony core instead of a center lined with Quartz crystals.



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AD-206  Quartz geode with Quartz pseudomorph after Anhydrite  $65

Juan Aldama, Municipio Aldama, Chihuahua, Mexico

8.7 x 8.1 x 2.9 cm

This is one of the more striking lithophysae (thunderegg) nodules that I have seen from Mexico. The cavity of this specimen is lined with a druse of shimmering Quartz crystals. The feature that really makes this specimen stand out is the Anhydrite crystals that have been fully replaced by Quartz. Mexican thundereggs aren't exactly known to be the sexiest specimens around but this one is an exception to that rule.



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AD-217  Calcite, Datolite, Prehnite geode  $80

Tiso, Funes, South Tirol, Trentino-Alto Adige, Italy

11.3 x 8.8 x 7.4 cm

Here we have an example of what the locals call “Teis spheres”. “Teis spheres” are well-known in Europe as basaltic geodes filled with well-crystallized minerals. This large, egg-shaped geode is filled with Prehnite balls, Calcite rhombs and tiny crystals of Datolite.


Agate, Cubuk, Ankara Province, Central Anatolia Region, Turkey
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AD-211  Agate  $40

Cubuk, Ankara Province, Central Anatolia Region, Turkey

8.7 x 5 x 2.6 cm

An Agate comprised of various shades of blue and of red. Around a portion of the rim are pseudomorphs after Anhydrite. When the Agate nodules are more completely filled with these pseudomorphs the are known by the locals as “Stick Agate”. There are many colorful Agates that recently being found at this location and it is slowly getting the recognition that it deserves.


Agate, Horní Halže, Klášterec nad Ohrí, Krušné Hory Mountains, Ústí Region, Czech Republic
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AD-150  Agate with Hematite  $75

Horní Halže, Klášterec nad Ohrí, Krušné Hory Mountains, Ústí Region, Czech Republic

12.3 x 10.4 x 3.5 cm

This Agate is unlike any I have seen from the Czech Republic.  During an early stage of its formation, membrane-like layers of minerals came off the walls of the cavity, broke and were deposited in a colloidal silica solution.  This Agate has a light-blue color that is accented by veins of silver-gray hematite that have colored the Agate red.  A very striking and eye-pleasing combination of colors.


Crandallite, Little Green Monster Variscite Mine, Clay Canyon, Fairfield, Oquirrh Mountains, Utah County, Utah
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AD-215  Crandallite  $60

Little Green Monster Variscite Mine, Clay Canyon
Fairfield, Oquirrh Mountains, Utah County, UT

6 x 5.6 x 2.6 cm

A nodule filled with finely-grained and larger, coarsely grained crystals of the phosphate mineral, Crandallite. A good example of this material.



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AD-185  Amethyst geode  $60

Idar-Oberstein, Birkenfeld, Rhineland-Palatinate, Germany

7.6 x 5.9 x 3.7 cm

Here we have a German classic, one half of an Almond-shaped, Amethyst geode from Idar-Oberstein. This example features Chlorite-dusted crystals measuring up to 1.2 cm in size. The area surrounding the twin cities of Idar & Oberstein gained notoriety for the fantastic Agates & Amethyst lined geodes discovered there in the mid 1500's. By the beginning of the 1800's the production of material had fallen to a small fraction of what was found in its heyday.



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AD-189  Agate & Quartz Thunderegg  $40

Dugway Mountains District, Dugway Range, Tooele County, UT

9.2 x 8.2 x 3.1 cm

A really good quality Dugway nodule. I acquired this specimen as an uncut nodule about 15 years ago at one of those places where you pick out a geode and they cut it for you. When it had been cut open the person operating the saw rinsed it and took a look, then offered me double what I paid for it. Needless to say, I politely declined. The cavity in this nodule is probably the most eqaunt that I have seen from Dugway. This specimen has been polished to a mirror-like finish.



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AD-165  Agate & Quartz Thunderegg  $120

St. Egidien, Glauchau, Zwickau, Saxony, Germany

16.6 x 14.2 x 7.3 cm

A large specimen from Germany's premier thunderegg locality. The dense banded outer layers of deep-blue grades to a sky-blue core. This colorful thunderegg also features several small pockets of quartz.



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AD-175  Amethyst geode  $40

Nosy Varika, Vatovavy Fitovinany, Madagascar

11.5 x 8.2 x 5.0 cm

A peculiarly shaped geode from a recent find in Madagascar. This specimen features a thin rim of Agate and a 4.5 cm vug lined with crystals of Amethyst.


Opal nodule, Spencer Opal Mine, Spencer, Clark County, Idaho
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AD-143  Opal nodule  $325

Spencer Opal Mine, Spencer, Clark County, ID

8.4 x 7.7 x 6.1 cm

When you think of American Opal, the Virgin Valley in Nevada is usually the first to come to mind.  This specimen hails from America's other large Opal location, Spencer, Idaho.  With a population of 38, it is home to one of the largest Opal deposits in the United States.  This is one of the most vividly colored Opals of this size that I've seen from this location.  While the center of this nodule is opaque, the rest of the specimen more than makes up for this.  This colorful Opal nodule has a strong saturation of color, more than my photographic skills can capture.  Broad flashes of green, blue, violet and a little red can be seen no matter how the nodule is oriented.  The Opal at this mine are contained in a Rhyolite and Obsidian flow with abundant gas pockets. Hydrothermal fluids from hot spring activity filled the pockets with both common and precious Opal.  A colorful specimen that is sure to brighten up any mineral display.


Dryhead Agate, Dryhead Agate Mine, Bighorn River Area, Pryor Mountains, Carbon County, Montana
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AD-160  Agate  $85

Dryhead Agate Mine, Bighorn River Area, Pryor Mountains, Carbon County, MT

7.2 x 6.7 x 5 cm

A very colorful sedimtary Agate from Montana. Sedimentary Agates are formed in sediments as opposed to being formed by filling cavities in the rock during secondary processes in volcanic rocks. Dryhead" Agates, with their gorgeous colors and patterns locked inside the surrounding nodules, are prized by Agate collectors. This one shows banding of pink-red & several hues of orange surrounding a contrasting white core and encased in a coffee-colored matrix. The Dryhead Agates were named after many bison skulls found near the site. That was where the Native Americans were said to run the bisons over the cliff, killing many of them, and then arranging the bison skulls in ceremonial manner.


Agate & Amethyst geode, Ametista do Sul, Rio Grande do Sul, Brazil
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AD-149  Agate & Amethyst geode  $80

Ametista do Sul, Rio Grande do Sul, Brazil

9.1 x 10.5 x 9.2 cm

I acquired this Agate about 10 or so years ago from a friend who imports a lot of material from Brazil.  I chose it because I had never seen one of this particular color that had an Amethyst vug at its center.  And I have yet to see another like it.  It was only recently that it dawned on me that I had seen this material, but it had been made into spheres. Which might explain why I had only seen this one intact geode half.


Chalcedony, Agate and Quartz, Potato Patch, Imperial County, CA
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AD-126  Chalcedony, Agate and Quartz geode  $60

Potato Patch, Hauser Beds, Palo Verde Mountains, Imperial County, California

12.5 x 10.4 x 4.7 cm.

While once abundant, the days of easy digging at the Potato Patch are over.  This location has long been a favorite spot to collect and has been hit hard over the years.  These days there is not much to be found there.  This example of Chalcedony, Agate and a little cit of coarsely-crystallized Quartz is classic, older material that Agate & Thunder-egg collectors hold in high regard.


Goethite geode, Dumbalk, South Gippsland Shire, Victoria, AustraliaGoethite geode, Dumbalk, South Gippsland Shire, Victoria, Australia
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AD-213  Goethite geode  $100

Dumbalk, South Gippsland Shire, Victoria, Australia

16.5 x 12.4 x 6.4 cm

A large, Goethite geode with highly lustrous interior. Some areas of of the interior exhibit a faint iridescence. I see these for sale every now and then, usually 6-7 cm in size, but this is the first one of this size that I have encountered.



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AD-194  Agate & Quartz with Goethite  $45

Estacion Ojo Laguna, Municipio Ahumada, Chihuahua, Mexico

6.2 x 4.8 x 3.1 cm

A white and grey-hued agate with a center portion of crystallized Quartz that has a dendritic growth of the mineral Goethite. The goethite adds color, providing a nice contrast of colors.



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AD-219  Quartz polyhedroid  $40

Paraíba, Brazil

6.5 x 3.4 x 4.1 cm

This polyhedroid specimen is from Paraíba, Brazil which is famous for its distinctive Blue-colored Tourmaline due to their high Copper content. These remarkable Agates were first found in 1974 by Odwaldo Monteiro and are all but impossible to obtain these days as the supply has been exhausted for many years. These anomalies of the Quartz family are occasionally seen for sale as polished slabs. It is rare that an intact example is seen for sale. I've done quite a lot of research trying to determine how these mineral oddities are formed. There are many hypotheses as to how these are formed. However, in the course of my research I have found that no two theories are the same. So just enjoy these for what they are, a most unusual Quartz specimen.



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AD-178  Quartz geode  $65

Juchem Quarry, Niederwörresbach, Herrstein, Birkenfeld, Rhineland-Palatinate, Germany

9.8 x 9 x 9.6 cm

A cavernous specimen of Quartz from the famous Steinbruch Juchem near Idar-Oberstein.  The Quartz crystals on this specimen are included by Goethite making them appear to be smoky in color. there is a small aperture in the rear of the specimen which helps illuminate this geode's interior.


Amethyst, Juchem Quarry, Niederworresbach, Herrstein, Birkenfeld, Rhineland-Palatinate, Germany
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AD-209  Amethyst  $45

Juchem Quarry, Niederwörresbach, Herrstein, Birkenfeld, Rhineland-Palatinate, Germany

15.4 x 12.8 x 4.5 cm

This specimen features glassy, grape-colored crystals of Amethyst.  The crystals on this specimen measure up to 1.6 centimeters in size. While there are several cracks in the matrix, it has not been repaired, only reinforced with a little glue on the rear.  If you've been looking to score a decent German Amethyst geode on the cheap, this is the one.



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AD-166  Agate & Quartz Thunderegg  $65

Mount Airy Mine, New Pass District, Lander County, NV

14.2 x 13 x 4.9 cm

Resembling the more famous St. Egidien nodules this specimen features bands of blue-colored agate wrapped around a core of tightly-packed Quartz crystals. This specimen has been polished to a good lustre. Specimens from this remote locality are hard to come by even for us local collectors.



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AD-188  Agate & Quartz Thunderegg  $45

Dugway Mountains District, Dugway Range, Tooele County, UT

12.3 x 7.5 x 2.8 cm

This is one of the more attractive Dugway geodes that I've encountered. This lithophysae nodule features alternating bands of blue and white and cavities lined with drusy Quartz crystals.


Celestite geode, Djebel Mezzouna, Tunisia
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AD-171  Celestite geode  $75

Djebel Mezzouna, Tunisia

10 x 7.3 x 5 cm

A geode filled with gemmy, water clear, well-formed tabular crystals of Celestite. The specimen has a small aperature at the back which serves to backlite the Celestine crysrtals. Examples of this material are very rare. An excellent addition too anyone's mineral collection.


Chalcedony geodeChalcedony geode
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AD-164  Chalcedony geode  $60

Turtle Mountains, San Bernardino County, CA

7.5 x 5.1 x 4.7 cm

A Chalcedony geode from the southeastern corner of the Mojave Desert.  Specimens from this location are hard-won and not common, especially ones with any color at all. This geode is light-pink in color and features a swirling, ribbed pattern on its exterior.



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AD-220  Calcite, Dolomite & Quartz geode  $40

Gray Quarry, Hamilton, Hancock County, IL

6.4 x 6 x 3.5 cm

crystal 2.8 x 2.8 cm

A Quartz-lined geode from one of Illinois' lesser known sedimentary geode locations. This specimen features many lustrous, saddle-shaped crystals of Dolomite up to 8mm as well as 2.9 cm cluster of Calcite crystals front and center.



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AD-181  Agate Thunderegg  $40

Agate Creek, Etheridge Shire, Queensland, Australia

10 x 6.7 x 2.4 cm

A vividly-colored lithophysae (thunderegg) Agate from Australia. The bands of Agate in this nodule are a deep, red-orange color. I've seen a decent quantity of banded Agates from this locality but thundereggs seem to be much more elusive.


Malachite pseudomorph after Azurite, Sir Dominick Mine, South Australia, Australia
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AD-114  Malachite & Azurite  $35

Sir Dominick Mine, South Australia, Australia

4 x 3.2 x 2.4 cm.

An excellent, complete all-around floater, rosette-like nodule of Malachite pseudomorphing sharp, bladed Azurite crystals from the famous Sir Dominick Mine of South Australia.  This old classic Australian copper mine was active from 1862-1920.  You can see a tiny remaining spot of blue from the Azurite in the center, near the bottom.



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AD-187  Agate & Quartz Thunderegg  $50

St. Egidien, Glauchau, Zwickau, Saxony, Germany

9.6 x 6.5 x 2.8 cm

This double Thunderegg specimen features bands of deep-red Agate and a core of colorless Quartz crystals in star-shaped formations. St. Egidien is considered to be Germany's premier thunderegg locality.


Calcite geode, US Highway 27 Roadcut, McCreary County, KY
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AD-135  Calcite Geode  $60

US Highway 27 Roadcut, McCreary County, KY

11.5 x 9.5 x 5.2 cm.

A really cool specimen. Although it is not apparent in the photo this specimen is very 3 dimensional. Also, the stacked brownish rhombs of Calcite make for a nice contrast against the lining of smaller white Calcites.



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AD-190  Agate, Chalcedony & Opal Thunderegg  $65

Richardson Ranch, Madras, Jefferson County, OR

14.7 x 14.1 x 7.6 cm

Here we have a triple-chambered thunderegg from northern Oregon. The reddish-brown-colored rind combined with the white, blue and black-hued interior makes for a nice contrast of colors. Multiple-chambered thundereggs are uncommon, more so triple, quadruple, etc... chambered nodules.



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AD-191  Agate  $40

Dryhead Agate Mine, Bighorn River Area, Pryor Mountains, Carbon County, MT

6.6 x 6 x .8 cm

A very colorful sedimentary Agate from Montana. Sedimentary Agates are formed in sediments as opposed to being formed by filling cavities in the rock during secondary processes in volcanic rocks. Dryhead" Agates, with their gorgeous colors and patterns locked inside the surrounding nodules, are prized by Agate collectors. This one shows banding of orange-red & ochre encased in a grey-brown-colored matrix. The Dryhead Agates were named after many bison skulls found near the site. That was where the Native Americans were said to run the bisons over the cliff, killing many of them, and then arranging the bison skulls in ceremonial manner.



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AD-179  Agate & Quartz Thunderegg  $35

Nowy Kosciól, Gmina Swierzawa, Zlotoryja County, Poland

8.7 x 6.3 x 3.6 cm

This specimen features vibrant, orange and red-colored Agate, clear Quartz surrounding a reddish Agate core. Thundereggs such as these are rarely available outside of Europe.


Quartz geode, Kenfig Sands, Porthcawl, Bridgend, Wales, UK
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AD-123  Quartz & Hematite geode  $60

Kenfig Sands, Porthcawl, Bridgend, Wales, UK

7.5 x 7 x 2.6 cm.

Here we have a geode that very much resembles the more famous nodules from the Dulcote Quarry which is about 30 or so miles to the southeast. This ocean front location has been known for its geodes since at least the 1800's. According to H.T. De La Beche, in his Memoirs of the Geological Survey published in 1846, he puts forth the theory that these are weathered out of the seabed offshore and wash up on the beach.



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AD-192  Celestine & Quartz in Chalcedony geode  $40

Chalcedony Beds, San Rafael District, Emery County, UT

8.8 x 7 x 4.2 cm

A brick-colored nodule of Chalcedony that has a cavity that is lined with colorless Celestine crystals and tiny crystals of Quartz.



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AD-193  Agate & Quartz pseudomorph after Horn Coral  $35

Red Horn Coral Occurrence, Rileys Canyon, Woodland, Summit County, UT

8.7 x 5.2 x 2.3 cm

Here we have an Agatized red horn coral, Caninia contorta, from east of Salt Lake City, Utah. The coral is close to 350 million years old and was once buried under a layer of volcanic ash that provided the silica for the Agates that fill in the coral skeleton. Meanwhile the central part of the former calcareous skeleton has been entirely replaced by Quartz.



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AD-198  Agate  $60

Amerzgane, Ouarzazate Province, Drâa-Tafilalet Region, Morocco

10.4 x 4.5 x 5.0

A blue-grey & white-hued Agate that exhibits a great parallax. This specimen could easily be mistaken for a Laguna Agate, that's how strikingly it “winks”. A parallax is an effect which is sometimes referred to as “winking”. When a banded Agate forms with close alternating opaque and transparent bands, the light entering the Agate can cast an observable shadow from one opaque band onto the next. As the parallel bands change their perceived angle, the appearance of movement and perception of depth occur. The finer the banding, the more striking this effect is.



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AD-199  Agate with Gypsum & Calcite  $65

Ysterputz Mine, Ysterputs Farm 254, Karasburg West, Karas Region, Namibia

6.3 x 3.1 x 5.8 cm

A brightly-colored example of Blue lace Agate from southern Africa. The color of this specimen is not caused by any impurity but by a phenomenon known as the Tyndall effect. The Tyndall effect is light scattering by particles in a colloid or in a very fine suspension. The vug and outer portions of this specimen are encrusted with tiny crystals of Gypsum and a few small spherical Calcites.


Agate and Quartz, Rimsberg, Birkenfeld, Rhineland-Palatinate, GermanyAgate and Quartz, Rimsberg, Birkenfeld, Rhineland-Palatinate, Germany
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AD-167  Agate with Quartz  $50

Heimbach, Baumholder, Birkenfeld, Rhineland-Palatinate, Germany

8.7 x 4 x 1.7 cm

A deeply-colored agate surrounding a a group of tightly compacted Quartz crystals. In addition to its vivid red color there are swirls of brown which provide a nice contrast of colors. Agates from this locality are very difficult to come by. The area surrounding the twin cities of Idar & Oberstein gained notoriety for the fantastic Agates discovered there in the mid 1500's. By the beginning of the 1800's the production of material had fallen to a small fraction of what was found in its heyday.



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AD-201  Lake Superior Agate  $50

Keweenaw Point, Keweenaw County, Michigan

5.5 x 3.7 x 2.2 cm

Here we have a “Laker” as they are called by agate collectors. Believed to be the world's oldest Agates, over 1 billion years old, these are found throughout the northern US having been spread from the original Lake Superior region by glaciation. These agates generally have pale coloring. This example has good a good red-orange color at its core grading to a lighter hue in its upper portion, but not what would be considered pale.



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AD-202  Barite nodule  $35

Col de Pré Guittard, Arnayon, Drôme, Auvergne-Rhône-Alpes, France

8.5 x 7.1 x 2.5 cm

A Septarian nodule with a core of subhedral crystals of Barite. The Barite has a mild fluorescence. Septarian nodules contain angular cavities or cracks, called “septaria”. This word comes from the Latin word septum, meaning partition.



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AD-204  Prehnite nodule  $50

Wave Hill, Victoria-Daly Region, Northern Territory, Australia

7 x 4.3 x 3.2 cm

This specimen hails from a locality that is better known for the Amethyst specimens and the Agate specimens that are found there. This nodule features a center of white, Natrolite surrounded by very clear, green-colored Prehnite.



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AD-207  Agate (exhibiting displacement)  $50

Estacion Ojo Laguna, Municipio Ahumada, Chihuahua, Mexico

7.6 x 3.8 x 3 cm

A lavender-pink-colored Agate from mexico's most famous agate location. This specimen has an almost transparent body with tight banding in the center. A neat feature of this specimen is a seam running down the left side of the specimen that resulted in the displacement of a portion of the nodule.



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AD-176  Agate  $50

Wave Hill, Victoria-Daly Region, Northern Territory, Australia

6.5 x 5.7 x 3.5 cm

A vividly-colored Agate from down under. this specimen features alternating copper-colored bands of Agate with a white core. this Agate has a good parallax. When a banded Agate forms with close alternating opaque and transparent bands, the light entering the Agate can cast an observable shadow from one opaque band onto the next. As the parallel bands change their perceived angle, the appearance of movement and perception of depth occur. The finer the banding, the more striking this effect is.



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AD-177  Smoky Quartz geode  $50

Mooralla, Southern Grampians Shire, Victoria, Australia

5.7 x 5.5 x 3.9 cm

Inside a Quartz crystal-lined rhyolite geode are two intergrown crystals of Smoky Quartz. 25-30 years ago these were fairly common but lately the trend seems to be to bust up the geodes so that the Smoky Quartz is fully exposed. These are classics for Australia.


Amethyst and Chalcedony geode, Dugway Mountains District, Dugway Range, Tooele County, Utah
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AD-145  Amethyst & Chalcedony geode $50

Dugway Mountains District, Dugway Range, Tooele County, UT

10.1 x 7.3 x 2.6 cm

This is one of the more colorful Dugway geodes that I have come across in my 30+ years of collecting.  What you typically get with a Dugway are washed out earth tones and if you are lucky, light blue Chalcedony and some small crystals of Quartz.  This multi-chambered nodule has a good red-brown hue accented by bands and areas of green with a central chamber of rich-colored Amethyst.  Amethyst is rarely found at thios locality.


Opal nodule, Yowah Opal Field, Paroo Shire, Queensland, Australia
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AD-146  Opal nodule  $35

Yowah Opal Field, Paroo Shire, Queensland, Australia

6.9 x 3.6 x 1.7 cm

This striking specimen of “Yowah Nut” Opal consists of a Sandstone nodule that is permeated by Opal of many different colors that it makes for a very colorful and aesthetic specimen.  This is the first one of these that I have encountered that has a hollow center.


JChalcedony variety Jasper, Cairo, Egypt
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AD-106  Chalcedony variety Jasper  $60

Cairo, Al Qahirah Governorate, Egypt

7.8 x 5.9 x 2.1 cm.

When I was in Egypt in April 2010, I saw many nodules of Jasper and Chalcedony just lying around on the ground out in the desert near Cairo.  I wondered why no one has ever offered this material for sale.  In 2011, while at the Tucson show, I was fortunate enough to run into a dealer who had some of these nodules for sale.  I made a trade with him for two of these specimens.  It was explained to me that these colorful nodules are difficult to polish.  Jasper is a dense, opaque, microcrystalline variety of Quartz. Or more strictly; Chalcedony and is usually red, brown or yellow and coloured by Iron oxides.  I think I chose some good ones, with nice earth-colored tones and interesting banding.  One thing that I have noticed in my many years of collecting is that there is not too much available when it comes to Egyptian minerals.  These colorful Chalcedony nodules are somtines called “Sahara Agate”.


Chalcedony variety Jasper, Cairo, Egypt
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AD-105  Chalcedony variety Jasper  $50

Cairo, Al Qahirah Governorate, Egypt

7.5 x 6 x 2 cm.

When I was in Egypt in April 2010, I saw many nodules of Jasper and Chalcedony just lying around on the ground out in the desert near Cairo.  I wondered why no one has ever offered this material for sale.  In 2011, while at the Tucson show, I was fortunate enough to run into a dealer who had some of these nodules for sale.  I made a trade with him for two of these specimens.  It was explained to me that these colorful nodules are difficult to polish.  Jasper is a dense, opaque, microcrystalline variety of Quartz. Or more strictly; Chalcedony and is usually red, brown or yellow and coloured by Iron oxides.  I think I chose some good ones, with nice earth-colored tones and interesting banding.  One thing that I have noticed in my many years of collecting is that there is not too much available when it comes to Egyptian minerals.  These colorful Chalcedony nodules are somtimes called “Sahara Agate”.


Agate Thunder Egg, Nowy Kosciól, Kaczawskie Mts, Lower Silesia, Poland
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AD-138  Agate & Quartz Thunder Egg  $60

Nowy Kosciól, Kaczawskie Mts, Lower Silesia, Poland

8.5 x 9.3 x 4.1 cm

Here we have a multicolored Agate and Quartz Thunder Egg with a small vug at its center. The Agate portion shows fine banding with an inner rim of flame-colored Chalcedony.  Nowy Kosciól is a classic Polish locality.  Thunder Eggs such as these are highly prized by Polish Agate collectors and are rarely available outside of Europe.


Agate & Quartz geode, Valle Escondido, San Rafael Department, Mendoza, Argentina
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AD-148  Agate & Quartz geode  $35

Valle Escondido, San Rafael Department, Mendoza, Argentina

5 x 4.6 x 3.8 cm

A very colorful specimen from south America's other agate location, Mendoza Argentina.  Agates from this location have a reputation for being as colorful as their Brazilian counterparts.



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AD-182  Moss Agate  $45

Ambato-Boeni, Boeny, Madagascar

10.3 x 6.2 x 3.2 cm

This specimen features dendrites of various shades of a green and brown-colored mineral. The first thing that occurred to me when I first saw this specimen is how much it reminded me of the mountain lakes here in the Sierra Nevada Range in the summer and fall when the grasses and weeds have had time to proliferate. This Agate has a depth of field to it that is like looking into a body of water.



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AD-183  Chalcedony & Quartz Thunderegg  $50

Buchanan Beds, Harney County, OR

10.8 x 9.3 x 2.8 cm

Here we have a triple-chambered thunderegg from southeast Oregon. The green-colored rind combined with the white and red-hued interior makes for a nice contrast of colors. Multiple-chambered thundereggs are uncommon, more so triple, quadruple, etc... chambered nodules.



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AD-184  Agate & Quartz Thunderegg  $85

Lierbach Valley, Oppenau, Black Forest, Baden-Württemberg, Germany

19.5 x 14 x 6.4 cm

Here we have a very large section of Agate from Germany's Black Forest. The center of this slate-green-colored Agate is filled with Quartz crystals. The two chambers of this Agate have sparkling Quartz crystals and a rust-red-colored mineral, most likely Hematite. There are many Agate localities all over Germany, but few Agates ever make it to the United States.


Agate Thunder Egg, Nowy Kosciól, Kaczawskie Mts, Lower Silesia, Poland
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AD-137  Agate Thunder Egg  $60

Nowy Kosciól, Kaczawskie Mts, Lower Silesia, Poland

10.2 x 9.2 x 4.4 cm.

A multicolored Thunder Egg type Agate with a hollow center from a classic Polish locality.  Thundereggs such as these are highly prized by Polish collectors and are rarely available outside of Europe.


Calcite Geode, Bou Azzer District, Tazenakht, Ouarzazate Province, Drâa-Tafilalet Region, Morocco
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AD-147  Calcite geode  $35

Bou Azzer District, Tazenakht, Ouarzazate Province, Drâa-Tafilalet Region, Morocco

9.5 x 4.7 x 7.2 cm

A geode filled with many lustrous and clear crystals of Calcite measuring up to 1.7 centimeters in size.  If you examined, in person, the matrix that these occur in you'd be surprised that they can be extracted more or less intact.


Calcite Geode, St. Francisville, Clark County, Missouri
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AD-072  Calcite Geode  $50

St. Francisville, Clark County, Missouri

9 x 6 x 4 cm.

A showy specimen of translucent and lustrous Calcite crystals inside of a Quartz-lined Geode.  This specimen is from an obscure location and is older material that is not often seen for sale.


Opal Thunder Egg, Opal Butte, Morrow County, OR
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AD-141  Opal Thunder Egg  $30

Opal Butte, Morrow County, OR

5.5 x 4.7 x 2.4 cm

One thing that Oregon has an abundance of is Thunder Eggs.  There are plenty of Thunder Eggs that are filled with Quartz and Agate, but not many that are filled with Opal.  This specimen has very subtle pink-colored flash.


Agate and Quartz geode, Lierbachtal, Schwarzwald, Germany
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AD-113  Agate and Quartz geode  $75

Lierbachtal, Oppenau, Schwarzwald, Germany

13 x 12 x 3 cm.

Here we have a very large section of Agate from Germany's Black Forest.  The center of this slate-colored Agate is filled with Quartz crystals.  The section of this Agate that has the Quartz crystals is outlined by a red-colored mineral, most likely Hematite.  In my 23 years of collecting I have only seen one other example of this material.  There are many Agate localities all over Germany, but few Agates ever make it to the United States.


Aqate and Quartz geode, Iraí, Alto Uruguai Region, Rio Grande do Sul, Brazil
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AD-118  Agate and Quartz geode  $25

Iraí, Alto Uruguai Region, Rio Grande do Sul, Brazil

6.2 x 5.4 x 4.5 cm.

While it is true that Agate specimens from Brazil are very abundant, every once in a while you find examples that are more interesting than most.  A while back, while visiting with a friend of mine that has a shop in San Diego, he showed me about 50-60 Agates that had been polished all around, not just on the front face.  As a rule, I don't buy Agates from Brazil, but I was impressed enough with what he showed me to buy a half dozen of them.  This specimen has an outer band of light- blue with a sandy-yellow colored bands, followed by clear Quartz at the center where there is a cavity lined with a druse of small Quartz crystals.  Not your everyday Agate from Brazil.


Agate with Quartz, Idar-oberstein, Germany
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AD-087  Agate with Quartz  $35

Idar-Oberstein, Rhineland-Palatinate, Germany

11.2 x 7.5 x 3.5 cm.

Here's something that you don't see for sale very often. The area surrounding the twin cities of Idar & Oberstein gained notoriety for the fantastic Agates & Amethyst lined geodes discovered there in the mid 1500's. By the beginning of the 1800's the production of material had fallen to a small fraction of what was found in its heyday. This specimen features finely banded gray, white and pink Agate alternating with layers of Quartz. While occasional specimens can be found, there is no steady supply of material from this classic location.


Agate, Idar-Oberstein, Rhineland-Palatinate, Germany
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AD-088  Agate  $30

Idar-Oberstein, Rhineland-Palatinate, Germany

7.2 x 5.4 x 5.6 cm.

Here's something that you don't see for sale very often. The area surrounding the twin cities of Idar & Oberstein gained notoriety for the fantastic Agates & Amethyst lined geodes discovered there in the mid 1500's. By the beginning of the 1800's the production of material had fallen to a small fraction of what was found in its heyday. This polychromatic Agate features finely banded layers of gray, white and pink making for a specimen with a striking contrast of colors. While occasional specimens can be found, there is no steady supply of material from this classic location.