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Mineral Specimens with Calcite
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A cluster of frosted, colorless, translucent, and doubly terminated crystals are perched in a sculpted manner on a matrix of basalt. The largest crystal is 5 cm in length. This specimen has such a nice balance to it. 5.6 x 5.2 x 4.1 cm
Light golden, doubly terminated, and well formed calcite crystals, are aesthetically arranged on a matrix of dolomite along with minor iridescent chalcopyrite. The largest of the calcite crystals exceed 5. 75 cm in length. SUPERB example! 6.2 x 6 x 3.3 cm
This small find came out around 1999 and was first mislabelled as smithsonite. It turned out to be unusual;, cuprian rich calcite in sharp crystals - quite a novelty for calcite! Cuprian calcite had been found before in good form only rarely , and never as intensely colored as this. Sitting on matrix, is a plate of uniformly bladed, lustrous, intergrown, crystals of green, calcite. Minor smears of malachite on the underside gave a hint that the coloring agent of the calcite was copper. It is an exquisite, 3-dimensional mound complete about 300 degrees around. 9 x 6.2 x 6.2 cm
When did you last see a transparent, lustrous, lilac colored scalenohedron of calcite, from Missouri, or, from anywhere? A bruised termination is the only drawback to this otherwise remarkable specimen (very slight cleaves a tthe tip, only noticeable up close and typical in any case of old tristate material). These lavender calcites came from one small mine, near Joplin, in the 1940s. MOST of them were rhombohedral, and this is the only large and fine scalenohedral example I have ever seen. The color is immediately recognizable and is truly unique for calcite, and for the district. I am not aware of any more having been found elsewhere outside this small mine, and it was closed by the mid-1950s. Truly a midwest rarity! 9 x 7 x 4.3 cm
Technically speaking, this specimen was not a part of Marty’s stalactite collection but was instead in his general collection. But it could have been, by appearance, even though it is not actually a stalactite! It actually features a 9 cm, light golden, transparent, and lustrous, calcite crystal that has been mostly enveloped by a druse of light yellow, cm size, calcite crystals, that show no obvious point of attachment. This is one impressive calcite crystal cluster. It is much more yellow in hue, in person, and quite beautiful. 9.6 x 4.3 x 4.2 cm
A fine druse of mirror bright, iridescent, pyrite has covered this specimen nearly completely, even around the sides of the matrix shard! The most obvious area is the coating on a 2.5 cm, doubly terminated calcite crystal. This is a fine and rare occurrence from Tasmania. BRIGHTER, and BETTER IN PERSON 5.25 x 4 x 2.2 cm
This is a very rare drill core section, complete all around and showing clearly its origins, that cut into a natural pocket of sulfur from deep in the ground! It has a particularly large, yellow, gemmy crystal of sulfur to almost 2 cm , perched on contrasting spiky white calcite crystals. It is beautiful! Geologists during the 1970s and 1980s used to keep these rare core pockets of sulfur whenfound, and give them as gifts around the area here in Texas. In practice, they are almost impossible to find on the market for this reason. After all, nobody really could have afforded to collect them as specimens per se, not when spending tens of thousands of dollars per drill, if not more! And then, many didn't go to collectors, but to mining companies for unique office decor. In a way, that makes these the world's most expensively mined mineral specimens, I suppose. I have seen only half a dozen over the years since moved to Texas the first time, in 1991. These two ar ethe best I have actually seen up for sale. 11.6 x 11.6 x 7.2 cm
This dramatic piece was part of Marty Zinn’s stalactite sub-collection. This tan flowstone stalactite has luster and exhibits growth-ring segments. If this piece had been from an American cave, the authorities would have intervened! No such rules in Mexico. It is really hard to get intact stalactites of this calibre out of caves (and you shouldn't, from a living cave!). 37.1 x 6.9 x 5.5 cm
This lovely matrix plate of cobaltoan calcite is comprised of rich pink, equant, crystals that average .5 cm across. The overall effect of this specimen is dazzling. 7.6 x 6.1 x 1 cm
Huge rhombohedrons of calcite are coated with iridescent overgrowths of pyrite or perhaps of chalcopyrite. The largest rhomb is over 11 cm across. Just a really unusual specimen! This is a unique specimen, with really oustanding display qualities. I have seen just a few of these in the past trickle out from some (to my knowledge) unnamed and undisclosed location in Hunan Province. 24.5 x 23.7 x 8 cm
A sharp specimen of English-quality crystals, but from Arizona! This is superb for the locality, and better in person! 5.8 x 3.7 x 2.5 cm
Perched on light tan matrix is a complete, doubly terminated, lustrous, crystal of rich pink manganocalcite ( x 8 x 5 cm). Specimens of this quality and size are only available from the breakup of old collections, and always have been even within Russia. It is truly outstanding for the form, condition, and wonderful color. The highly 3-dimensional crystal reaches 9 cm in length and also exhibits SUPER orange fluorescence. 14.5 x 9 x 3.6 cm
There have been tens of thousands of good to superb calcites from the basaltic flows in this region of Brazil. However, this doubly terminated, frosted and colorless, calcite crystal is so aesthetically perched on matrix, it boggles the mind. The crystal reaches 5.5cm in length and is PERFECT, as well as PERFECTLY BALANCED, on a natural pedestal. Talk about aesthetics! 6 x 5.9 x 4.9 cm
This is a unique combo specimen, the likes of which I have not seen before from the locality! A cluster of translucent, frosted, tabular, cream colored, fishtail-twins of Calcite is aesthetically perched on deep purple cubes of lustrous fluorite. All are translucent, in person, though its hard to convey the fluorite's color without overexposing the calcite in the picture. The sharply twinned Calcite crystals, with extremely well-defined twinning planes running down the a axis, reach 3 cm across, while the largest fluorite crystals are 2 cm across. This is just a lovely and unique combo specimen. 6.7 x 6.3 x 5.6 cm
This deposit, on the Crimean Peninsula of the Ukraine, usually produces the green, phosphate minerals, vivianite and anapaite, in clam shells. However, this is one of a relatively few examples I have seen of light pink rhodochrosite. This is very rare! And, a shell of such size is also very rare for the locality - to have crysatllized rhodo within is quite nice but the final notch in its fame is that the rhodochrosite is surrounded by a pretty layer of massive golden calcite which fille din the majority of the mass of the original shell, leaving a hole inside for the rhodo to line. The calcite is slightly buffed, I would think, to give it a smooth surface as you see it has (as if it were a geode half). To top off this remarkable specimen, the clam or mollusk shell is almost perfect, thus making this piece collectible for both mineral and fossil enthusiasts. It is really a unique piece of mineralogical wizardy, i think. 8 x 6.9 x 2.5 cm
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Rob Lavinsky, rob@irocks.com
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