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Mineral Specimens with Calcite
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from the Mineral of the Month Club: "We first saw these strange-looking specimens (also spelled "melicaria") at a show last fall, a new find from Mexico. From what little information that was available, it seems they are "a quartz cast after the crack-filling of a septarian nodule or possibly after a similar crack-filling spherulite," according to former Smithsonian curator John S. White." This HAPPENS to be an actual John S. White specimen, with his label accompanying it! It is an absolutely fascinating-looking specimen, like a fossil of some strange early life form. It is complete and undamaged all around. White''s label says this Melikaria is calcite rather than quartz. Ex Lewadny collection 8.2 x 6.8 x 6.2 cm
This wonderful tri-state piece, mined in 1993, is interesting on BOTH sides. On one, it consists of pretty, transparent nailhead calcites, with galena and pyrite crystals adding an accent. On the backside are pseudomorphs of pyrite after anhydrite crystals - having completely replaced the anhydrites while retaining their platy form. 10.2 x 5.6 x 4.4 cm
This fascinating specimen formed when gemmy calcite crystals grew in the natural pocket formed by a buried fossil clamshell. The interior of the shell is now completely covered with these fine, golden crystals. Unlike many of these specimens, this is a LARGE, COMPLETE shell - with windows broken into it so you can see the crystal-lined interior! 9.3 x 7.5 x 4.6 cm
Looking at this large specimen from the display face, it is difficult to tell exactly what is going on. You see what look like prismatic quartz crystals (in form), as well as disk-like shapes, all with a sandy white surface. What it turns out happened, and what you can see from underneath, is that there were seams of layered calcite intermixed with quartz crystals, and a coating of microcrystalline quartz covered the whole surface like snow, leaving this landscape of strange forms. 10.3 x 10.0 x 4.2 cm
This gorgeous specimen has two beautiful deep-green emerald crystals perched among jewel-like, multifaceted calcites that really accent the emeralds and contrast with the green. The major emerald atop is 1.5 cm long and is exceptionally gemmy. In fact, it contains gem rough equal to several thousand dollars in cutting value. It literally glows with bright color and internal brilliance. The secondary crystal is equally good interms of gem rough value and quality, though it has a minor ding on the upper edge of its termination that detracts a little bit, as a specimen. I was tempted to remove this crystal entirely as it has also some gem value (especially as it seems to extend inwards under the calcite!). However, I decided to leave it in, as the extra color splash really does add panache to the specimen and the small ding isn't visible from afar anyhow. Nevertheless, it could be clipped and sold as facet rough down the road. 4.4 x 4 x 3 cm
This juicy specimen has great aesthetics, perched front and center on matrix as it is! The crystal is 4 cm long and 10-1mm thick. The crystal is terminated atop (though with a contact on the back of that termination that is in any case not visible from the display face) and is probably terminated on the bottom, though it is rough there and so the termination is a "technical" contacted termination at best where it had grown against another mineral, though again it looks fine from the front view. It has juicy, top color that is unmistakeable even to laymen, and it has some gemminess though it is not transparent or gem-quality per se. It is translucent through most of the length, and transparent at the tip. This dramatic crystal is associated with jewel-like, multifaceted calcites that really accent the crystal and contrast with it. As it is a long crystal, it has a natural fracture around the halfway point but this is hidden and held together by the surrounding calcite and is not detracting . 4.5 x 4.5 x 2.5 cm
19.0 x 17.2 x 9.8 cm. This is a superb example of Elmwood calcite: Rarely do you see such a large and gemmy doubly-terminated crystal with matrix, and in such condition. This hosts a doubly-terminated, twinned, gemmy crystal with a great cognac color, measuring 19 cm across. This crystal is beautifully perched on gray limestone matrix.
This is a stellar miniature with decidedly unusual aesthetics. It consists of extremely sharp silver crystals to just over 1 cm, perched on a calcite. It did come out of the Sorbonne via Gilbert Gauthier, though the label which once attested to this from Gilbert has been lost by an intermediate collector I sold this to some years ago, and so i have lowered the price a bit to compensate. KEEP YOUR LABELS! 3.0 x 2.8 x 2.5 cm
2.8 x 2.1 x 2.1 cm. A fine, dense nest of spinel-twinned silver crystals with a nice patina and a bit of calcite from the 1980s finds at the historic New Nevada Mine at Batopilas. The protruding "feathers" are a very nice accent.
A pretty “flower” of pastel pink manganocalcite (the manganese content tints it pink) accented by silky crystals of translucent selenite. 4.0 x 3.2 x 2.9 cm
A very large and just fabulous specimen of Norway calcite, not at all common on the market! The superb, transparent, lustrous crystals measure up to about 7 cm, and are sharp as razors. Phantom crystals with an internal druse of pyrite appear clearly inside of some of the crystals. 14 x 9.9 x 6.3 cm
Very difficult to photograph and ten times better in person – this is a huge, razor-sharp, transparent calcite crystal 9 cm long, nestled in a concave bed of stilbites and apophyllites. If you like it at all from the photos, you will love it in person, guaranteed – or I will gladly take it back! 15.7 x 13.6 x 5.1 cm
One of three specimens in this update cherry-picked from a very small find of fine calcites at Iowa’s Linwood Mine. Specimens from this find are very difficult to obtain, and this is a TOP-QUALITY one , with big, superb crystals measuring to 4.4 cm. The translucent crystals have a wonderful silky luster and are in superb condition. I was thrilled and surprised to find a flat of these with a small dealer at the show, and bought three of the best specimens in various sizes. This is old material exhibiting a classic crystal form 9.7 x 7.2 x 6.2 cm
The largest of three specimens in this update cherry-picked from a very small find of fine calcites at Iowas’s Linwood Mine. Specimens from this find are very difficult to obtain, and this is a TOP-QUALITY one from the find - a big, rich plate with crystals to around 4 cm. The translucent crystals have a wonderful silky luster and are in superb condition. I was thrilled and surprised to find a flat of these with a small dealer at the show, and bought three of the best specimens in various sizes. This is old material exhibiting a classic crystal form 14.8 x 10.9 x 3.6 cm
One of three specimens in this update cherry-picked from a very small find of fine calcites at Iowas’s Linwood Mine. Specimens from this find are very difficult to obtain, and this is a TOP-QUALITY one from the find, a superb miniature featuring two crystals (to 2.3 cm) perched elegantly on the matrix. The translucent crystals have a wonderful silky luster and are in wonderful condition. I was thrilled and surprised to find a flat of these with a small dealer at the show, and bought three of the best specimens in various sizes. 4.6 x 2.8 x 1.7 cm
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Rob Lavinsky, rob@irocks.com
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