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Gallery 8 Psuedomorphs & Mineral OdditiesReturn to Mineral Specimen Galleries
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  click on image for larger view Q-544 Blue Lace Agate with Chalcedony pseudomorphs after Calcite RESERVED Ysterputz Mine, Ysterputs Farm 254, Karasburg West, Karas Region, Namibia 13.3 x 9.2 x 3.7 cm A large specimen of Blue Lace Agate in layers below Chalcedony that has replaced Calcite. The Agate provided the silica for replacement of the Calcite crystals that were originally inside a vug. In other words, this piece preserves the full geological context of the pocket, with crystals in a vug in the ground, changing over time to another mineral due to alterations in the chemistry and environment. Many people label these specimens as being Chalcedony pseudomorphs after Fluorite. To me, the shape of the replaced crystals appear to be rhombs which rules out fluorite.
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.
C-219 Calcite pseudomorph after Ikaite (Glendonite) $40 Bol’shaya Balakhnya River, Taimyr Peninsula, Eastern-Siberian Region, Russia 3.8 x 4 x 3.1 cm. An interesting pseudomorph of a star burst-like cluster of the rare mineral Ikaite having been replaced by Calcite. This very well formed pseudomorph is better than most of the of these specimens that I've encountered in the past few years.
Q-534 etched Quartz $50 Hachupa, Shigar District, Gilgit-Baltistan, Pakistan 6.2 x 5.7 x 4 cm An extremely gemmy & transparent etched Quartz crystal. An interesting feature of this specimen is that some faces of the crystal are slightly frosted and some are water-clear. These Quartz crystals are a result of dissolution effects in a pocket, where an already formed crystal was later exposed to new hot fluids that removed molecules from the Quartz bit by bit, to create these surface effects. Resulting in these beautiful crystals with fascinating patterns.
F-288 Orthoclase pseudomorph after Eosphorite $50 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.
F-237 Fluorite & Barite pseudomorph after Anhydrite $180 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. The Barite is thought to be epimorphs after Laumontite. The contrasting colors make for a very aesthetic specimen. The perceived color of these Fluorites varies depending on the color temperature of the lighting that it is viewed under. This find was documented on Season 4, Episode 4 of the television show, Prospectors.
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.
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.
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.
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 lived in my collection until recently when I decided that I didn't need as many of these as I had accumulated.
H-096 Goethite pseudomorph after Marcasite $50 White Desert, Farafra Oasis, New Valley, Egypt 4 x 3.8 x 3.8 cm These dramatic pseudomorphs were originally formed as Marcasite crystals on the ocean bottom. These unusual specimens were later pseudomorphed to Goethite making for a very three-dimensional and attractive mineral specimen. These radial bursts of crystals 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.
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.
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.
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-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.
K-007 Cassiterite
in Kaolinite pseudomorph after Orthoclase $50 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 few and far between and are highly prized.
AD-206 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. as a rule, Mexican thundereggs aren't exactly known to be the sexiest specimens around but this one is an exception to that rule.
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.
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.
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 is a small imperfection on one corner, this specimen is still considered an really good example of this material. Examples of this material are getting quite difficult to find these days.
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-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 offered for sale.
C-278 Colemanite pseudomorph after Inyoite $75 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-477 interference Quartz $45 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.
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.
P-080 Pyrite pseudomorph after Pyrrhotite with Boulangerite $45 Noche Buena Mine, Municipio de Mazapil, Zacatecas, Mexico 7 x 5 x 3.1 cm. These specimens are striking in person, and this piece is no exception. This specimen features foliated, semi-"rose"-esque Pyrrhotites that have been replaced by shimmering metallic golden-colored Pyrite. Topping things off is a layer of fibrous Boulangerite crystals.
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.
P-029 Pyrite pseudomorph after Pyrrhotite with Calcite $40 Noche Buena Mine, Zacatecas, Mexico 7 x 5.5 x 6 cm. Here we have a classic mineral specimen from a long defunct location. This mound of Pyrrhotite crystals has been replaced by Pyrite, after which a second generation of cubic Pyrite and Calcite crystals formed on top of that. Specimens from this location are not often seen these days.
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