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Gallery 8 Psuedomorphs & Mineral OdditiesReturn to Mineral Specimen Galleries
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   click on image for larger view Q-536 Quartz
pseudomorph after Feldspar $225 Erongo Mountain, Karibib, Erongo Region, Namibia 11.8 x 6.7 x 10.2 cm A very large and interesting pseudomorph. This three-dimensional specimen is a complete and total replacement of nine Orthoclase crystals by tiny Quartz crystals which have a green cast. Also present on this specimen are fragments of Schorl. Being someone who has an appreciation for any mineral specimen that is out of the ordinary, I fell in love with these when I first saw them. A majority of the combinations of mineral species that can be found in Erongo are quite abundant, it seems to me that Pseudomorphs are under represented at this famous location. These never were very abundant and probably won't be in the future. This specimen was part of my collection until recently when I decided that I didn't need as many of these as I had accumulated.
C-273 Calcite with sand inclusions $50 Rattlesnake Butte, Jackson County, SD 6.2 x 5.5 x 2.7 cm A sculptural pair of interconnected, scalenohedral Calcite crystals. The Calcite grew in a sand matrix, capturing the sand as it formed making for an unusual specimen. Sand Calcites are poikiloblastic Calcite crystals included by a large amount of Quartz sand, sometimes exceeding 50%. These specimens were collected heavily in the 1960s-1970s but are seldom seen these days as much of this area is within an Indian reservation and collecting is prohibited.
C-316 Cookeite, Elbaite & Quartz cast after Tourmaline $135 Araçuaí, Minas Gerais, Brazil 12.9 x 7.6 x 5.2 cm A vug of Cookeite that once encased a large Tourmaline crystal that dissolved away leaving a bed of greenish-blue Elbaite on the lower front portion of the specimen. The termination of this specimen features a 2 cm Tourmaline crystal that has been replaced by Lepidolite. Also present on the Cookeite “shell” are several groups of Quartz crystals.
AD-226 Quartz pseudomorph after Apophyllite $135 Summer Storm Claim, Challis, Bay Horse Mining District, Custer County, ID 12.8 x 13.7 x 9 cm A large and fully intact vug of Apophyllite crystals that have been completely replaced by Quartz. Also present in this specimen are several flattened Calcite crystals set deep inside the vug. These pseudomorphs were a limited find made by John Cornish (Rat's Nest Claim Heulandite) in the early 2000's. This was, according to the miner, the only intact vug recovered from this find.
F-295 Orthoclase replacing Marialite $50 Pitwak Mine, Ladjuar Medam, Sar-e Sang, Koksha Valley, Badakhshan, Afghanistan 4 x 4 x 3 cm A group of Marialite crystals from small finds made 7-8 years ago. The Marialite crystals are pseudomorphing to Orthoclase. This specimen seems to have almost completely altered to Orthoclase as very little fluorescence is observed. The blue color of these specimens is thought to be most likely due to minute Fe impurities that transition between Fe+2 and Fe+3.
Q-558 Quartz (modified by lightning) $75 Serra de Espinhaco Mountains, Diamantina, Minas Gerais, Brazil 12 x 4 x 3.1 cm An example of Quartz that, inside the rock where it was formed, was submitted to a high electrical voltage created by lightning hitting the rock (not the Quartz crystal). Due to its piezoelectrical properties, the Quartz crystal submitted to this high voltage will expand or contract (depending on the signal of the electrical field, positive or negative). The result is a weird crack pattern that develops on the crystals faces of the Quartz. For many years, crystal miners in the Serra de Espinhaco Mountains of Brazil, where there are frequent thunderstorms, have reported finding these oddities. But only in the last 8-10 years have any, in limited quantities been available to collectors. The Espinhaco Mountains are constantly affected by orographic thunderstorms, which generate a high number of lightning bolts. These orographic flashes have some special properties: they reach speeds of up to 160,000 m\s and thereby generate plasma temperatures of 30,000 ° C in nanoseconds. There is a paper about these type of crystals that was published by Prof. Joachim Karfunkel et. al., from University of Minas Gerais, who found the explanation for these weird crack patterns. You can read about it (in German) here: Link to article
AD-206 Quartz pseudomorph after Anhydrite RESERVED 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 are the Anhydrite crystals that have been fully replaced by Quartz. As a rule, Mexican thundereggs aren't exactly known to be the sexiest specimens around but this one is an exception to that rule.
F-237 Fluorite & Barite pseudomorph after Anhydrite SOLD Moffat Tunnel, Cripple Creek District, Teller County, Colorado 6.6 x 4.5 x 2.3 cm. This specimen is from a small find made a few years back. This specimen consists of lustrous, lilac-purple Fluorite cubes covering intersecting sprays of flattened, elongated, white Barite crystals. The Barite is thought to be epimorphs after Laumontite. The contrasting colors make for a very aesthetic specimen. This specimen displays well from all sides, and is a good example of this material from this limited discovery. This find was documented on Season 4, Episode 4 of the television show, Prospectors.
T-326 Topaz pseudomorph after Orthoclase $95 Saubachriss, Muldenberg, Klingenthal, Vogtland, Saxony, Germany 6 x 4.8 x 3.9 cm Here we have an example of one of the more elusive pseudomorphs from Europe. A twinned Orthoclase crystal measuring 4.8 centimeters in length, that has been completely replaced by Topaz. While there is a small imperfection on one corner, this specimen is still considered an really good example of this material. Examples of this material, especially on matrix, are getting quite difficult to find these days.
Q-485 Quartz & Hematite cast after Calcite & Barite $95 Wölsendorf Fluorite Mining District, Upper Palatinate, Bavaria, Germany 9.3 x 7.7 x 7.2 cm This specimen shows the scalenohedral form of the Calcite crystal that it has replaced as well as the form of the blade-like Barite crystals. The Quartz crystals on this specimen are included by Hematite which makes for a nice contrast of colors. These specimens are ucommon, rarely do you see one of these Quartz after Calcite casts from Wölsendorf offered for sale.
AD-180 Chalcedony pseudomorph after Barite $40 The Poison Strip, Thompsons District, Grand County, UT 4.8 x 3.4 x 3.6 cm A striking nodule of yellow & red Chalcedony that has replaced the mineral, Barite. Specimens from this location are usually not as well-formed as the one before you. Hard to come by material.
Q-549 Chalcedony pseudomorph after Aragonite $65 Valle de las Plumas, Paso de Indios Department, Chubut Province, Argentina 9 x 7.6 x 7 cm This group of Aragonite crystals have been pseudomorphed by Quartz, included by Hematite which gives it its reddish tone. So what you have is Quartz in the exact form of the prior Aragonite crystals, having preserved their form perfectly. There is some translucence at the terminations of the crystals. Once abundant, I don't see these for sale too often these days.
R-045 Rutile pseudomorph after Anatase $50 Cuiabá, Gouveia, Minas Gerais, Brazil 2.5 x 1.3 x 1.1 cm A very colorful pseudomorph. This specimen features 2 different Titanium Oxides. The specimen consists of a group of silvery-tan colored, prismatic Anatase crystals. They are accented by small metallic golden-red colored Rutile crystals towards the center of the specimen which have partially replaced the Anatase. A very colorful pseudomorph.
K-007
Kaolinite pseudomorph after Orthoclase (Pig's Egg) with
Cassiterite $65 St Austell Mining District, Cornwall, England, UK 6.4 x 3.4 x 1.4 cm An excellent double-terminated & tabular, Carlsbad-twinned Orthoclase crystal that has been pseudomorphed by Kaolinite. Embedded in this specimen numerous crystals of the tin oxide mineral, Cassiterite. Kaolinite pseudomorphs after Orthoclase from Cornwall are not particularly rare but those that are included by Cassiterite are much harder to find and are highly prized.
T-308 Schorl with Beryl inclusion $60 Dara-i-Pech Pegmatite Field, Chapa Dara District, Konar Province, Afghanistan 2.8 x 2.4 x 2.5 cm. Just when you think that you've seen it all from Afghanistan, there's this specimen A lustrous crystal of Schorl that is include by a clear, colorless Beryl crystal. The Beryl continues down the length of the specimen with a small portion protruding from the Schorl's bottom. Another neat feature of this specimen are the pronounced and well-formed growth hillocks on its beveled termination. I have sold a good amount of material from Afghanistan over the last 27 years and I have only seen one other specimen like this.
F-288 Orthoclase pseudomorph after Eosphorite RESERVED Linópolis, Divino das Laranjeiras, Minas Gerais, Brazil 4.6 x 1.7 x .7 cm A brilliant-white-colored example of Orthoclase that has replaced the phosphate mineral, Eosphorite. these specimens are very uncommon and are rarely offered for sale.
C-313 Calcite & Diopside pseudomorph after Wollastonite $60 Pitcairn, St. Lawrence County, NY 5.4 x 4.2 x 3.6 cm A well-formed crystal of Wollastonite that has been replaced by Calcite & Diopside. Good looking, isolated examples of this material are uncommon. Labeled as being from Pitcairn, this specimen is most likely from the Rose Road skarn occurrence there.
F-286 Orthoclase pseudomorph after Leucite (Pseudoleucite) $65 Kalehöyük, Kaman District, Kirsehir Province, Turkey 6.2 x 6.1 x 5.5 cm A single equant crystal of Leucite that has been replaced by chalky white Orthoclase. A very rare and fine pseudomorph from an obscure locale.
H-098 Goethite pseudomorph after Marcasite (twin) $50 White Desert, Farafra Oasis, New Valley, Egypt 4.7 x 4 x 1.4 cm These Goethite pseudomorphs from the White Desert were originally formed as Marcasite crystals on the ocean bottom. These unusual specimens were later pseudomorphed to Goethite. This particular specimen has a different form than the usual starburst-like examples that made up the majority of the specimens found. This specimen started out a a flattened, twinned Marcasite crystal. These specimens were found in the remote west central desert of Egypt and dug up by French dealer Alain Carion. This find was made a number of years ago and I have not heard of any new material being found.
C-310 Calcite pseudomorph after Ikaite (Glendonite) $40 Carter Creek, North Slope Borough, AK 7.3 x 2.4 x 2.4 cm A doubly-terminated pseudomorph~alteration specimen of "Glendonite" from one of Americas's northernmost mineral localities. These specimens start out as the mineral Ikaite which is calcium carbonate but with a handful of water molecules attached to it. Once the Ikaite reaches a temperature above 8°C (46°F), it alters into Calcite.
Q-451 Chalcedony pseudomorph after Anhydrite $100 Agua Fria River, New River Station Area, Yavapai County, AZ 4.5 x 4.3 x 2.6 cm These dramatic Chalcedony pseudomorphs after Anhydrite were collected over a period of 10 years by my friend, Al Rose. This material has the distinction of being mentioned not once but twice in The Mineralogical Record's what's new in minerals. Not many of these were found and are much sought after by collectors of Arizona minerals as well as by pseudomorph collectors.
C-226 Calcite with sand inclusions $35 Sahara Desert, North Africa 5.3 x 3.6 x 2.5 cm. A group well-formed Calcite crystals that are included by sand. The specimen is a complete, all-around floater. The Calcite grew in a sand matrix, capturing the sand as it formed making for an unusual specimen. Sand Calcites are poikiloblastic Calcite crystals included by a large amount of Quartz sand, sometimes exceeding 50%. Q-552 Quartz pseudomorph after Gypsum (fluorescent) $50 Crawford Dam, Crawford, Dawes County, NE 9.5 x 8.7 x 7 cm Nebraska is not necessarily the first state that one thinks of when it comes to mineral specimens, but these pseudomorphs from Crawford are some of the more noteworthy specimens from anywhere in the Cornhusker State. This piece is a group of what were originally Gypsum blades that were completely replaced by Quartz. Areas of the interior portion of this specimen exhibit yellowish fluorescence under LWUV light and other areas have bright green fluorescence under SWUV illumination which suggests that specimen is made up of both Chalcedony and Quartz. Fluorescence in Quartz is rarely observed.
C-278 Colemanite pseudomorph after Inyoite $85 Boron, Kramer District, Kern County, CA 12.8 x 9.4 x 6.8 cm A dramatically formed pseudomorph of Colemanite after a very large Inyoite crystal from Boron, California. This pseudomorph is shaped like a big, 3-dimensional "checkmark", when viewed at the proper angle and proudly rests on a clayey matrix. The pseudomorph and matrix surface are uniformly covered with lustrous, white, 3-4 mm, colemanite crystals. Although contacted in several areas, this is an important example of this rare material. I have only seen perhaps 5-6 examples of these pseudomorphs in over 30 years of collecting.
Q-443 Amethyst cast after Calcite $95 Artigas, Artigas Department, Uruguay 7.5 x 4.1 x 3.5 cm. Here we have a complete all-around Amethyst cast after Calcite. This specimen consists of a tower of numerous medium-purple Amethyst crystals. If you look up the bottom of the specimen you will see the sharp, pseudohexagonal form of the dissolved Calcite crystal. The Calcite was completely etched away by corrosive solutions in the pocket, leaving the Amethyst. These specimens are one of nature's better looking mineral oddities.
F-287 Orthoclase pseudomorph after Leucite (Pseudoleucite) $35 Loucná, Ostrov, Karlovy Vary District, Karlovy Vary Region, Czech Republic 4.3 x 4.2 x 3.9 cm A pseudomorph of Orthoclase after Leucite with a tetragonal trisoctahedron form.
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.
C-135 Calcite peudomorph after Barite $35 Taouz, Er Rachidia Province, Meknès-Tafilalet Region, Morocco 5.6 x 3.1 x 3.5 cm. Here we are offering a really neat specimen; a stalactite-like stack of interpenetrating crystals of Calcite as large as 2.2 cm. that have replaced the mineral Barite. The contrast between the sand color and the orange-red portions of this mineral specimen make for interesting specimen.
G-125 Andradite Garnet with Epidote $50 Marki Khel, Spin Ghar Range, Khogyani District, Nangarhar Province, Afghanistan 5.7 x 3.5 x 1 cm. This is one of the more weirdly-formed Garnets crystals that I have come across. This specimen consists of a cinnamon-brown Andradite that looks as if it has been squeezed while it was forming and is accented by several small areas of pistachio-green Epidote. This uncommonly-shaped Garnet is 100% complete all-around, has no damage with a great lustre as well as some areas where it is transparent. Quite different from your usual Marki Khel Garnet specimen.
Q-477 interference Quartz SOLD Bor Pit, Dal'negorsk B Deposit, Dalnegorsk, Primorsky Krai, Russia 7.6 x 2.4 x 2 cm An unusually-shaped, translucent, colorless Quartz crystal known as “interference”Quartz from the famous Bor Pit at Dalnegorsk, Russia. These crystals are unique to the Bor Quarry. The Quartz crystal growth was interrupted by Calcite, as evidenced by stacked, poker chip-looking section in the middle of the crystal. This unique piece is complete all-around, with only slight contacting on the bottom termination.
L-035 Lepidolite pseudomorph after Tourmaline $50 Itinga, Minas Gerais, Brazil 6 x 2.2 x 1.5 cm. A very lustrous specimen of Lepidolite replacing Tourmaline. Traces of green-colored Tourmaline can be seen on closer examination. This specimens is an “old timer” that was found in the 1970's.
H-073 Hematite pseudomorph after Siderite on Microcline $50 Lake George, Park County, CO 4 x 3.9 x 2.6 cm. This magnificent, as far as pseudomorphs are concerned, mineral specimen was found around 15 years ago by friends of mine from southern California while on vacation in Colorado. Being a collector of pseudomorphs myself, I am greatly impressed by the faithful replacement of the Siderite by the Hematite. Most pseudomorphs do not retain such an exact form of the mineral species that they have replaced. The Hematite pseudomorphs are perched on a crystal of Microcline making for a nice contrast of colors.
A-119 Aragonite stalactite section $30 Wheeler Peak, White Pine County, NV 7 x 5.8 x 5.5 cm Here we have a polished section of an Aragonite stalactite from a remote location from the easternmost part of central Nevada.
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