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Mineral Specimens with Calcite
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10.0 x 9.3 x 8.7 cm. This unusual Naica piece is more starkly octahedral than others you normally see from the locale. It is an older specimen. It dates from, probably, the early 1980s. The piece has two large octahedra in the middle, coated in front by a blanket of dogtooth calcites. The contrast is very nice. The octahedra have slight cubic modifications, you can see, at their very tips. But they are still more octahedron than cube by far and as such are the exception at Naica.
10.1 x 6.2 x 5.7 cm. A sizeable cluster of translucent rhombs of calcite, measuring to 1.5 cm, richly included by moss-green duftite. A classic combination from this classic locality. This is a gorgeous specimen with great lustre.
11.4 x 7.4 x 4.9 cm. This find was made a couple of years back in China, and is absolutely unique: glittery, golden pyrite microcrystals preferentially deposited on the edges and faces of flattened, translucent, pastel-pink, manganoan calcite rhombs. The calcite rhombs reach 5.0 cm on this fine cabinet piece. Some of the specimens had very sparse coverage of pyrite, just a salting, but here, it is richly carpeting the crystal edges and faces.
6.5 x 5.0 x 2.4 cm. A classic and fine specimen from Santa Eulalia, Mexico and the Consie Prince Collection. The sturdy piece looks like a "forest" of lustrous, honey brown-colored mimetite crystals having a very interesting, tree-like look with the calcite crystals hidden amongst them. These are often mistakenly thought to come from the Ojuela or Corralitos locales.
A gorgeous, twisting stalactite (helectite when from the side) of intergrown calcite crysatls in the form of flattened rhombohedra; one upon the other in a loop up and down again! Small specks of malachite are present, proving it is from a copper mine, as well. COMPLETE-ALL-AROUND 5.3 x 4.2 x 4 cm
THis mesmerizing, complete-all-around specimen is composed of dozens of disc-shaped calcite crystals arranged into a pagoda-like structure with stalks shooting out in either direction . It is complete all around save for the very bottom which acts as a natrual base for display and is quite distinct from previous finds at this mine. IN person, it has a pleasing pale pink/mauvre hue to it. 12 x 8.5 x 8 cm
4.4 x 4.1 x 3.1 cm. An old-time and aesthetic pseudomorph from the ancient mines at Ilmenau, Germany. Lustrous, metallic-gray pseudomorphs of hematite after sharp calcite scalenohedrons to 2.0 cm are attractively set atop massive, banded hematite matrix. 4 of the 5 major pseudomorphs are pristine.
6.4 x 4.4 x 2.4 cm. A showy, old-time specimen of calcite "cave pearls" or pisolites from a classic Czech locale - Carlsbad (Karlovy Vary), Bohemia. Pisolites are spheroidal, concentric concretions of calcium carbonate. Accompanied by an expertly handwritten, faded label from an older collection. The collection this came out of was a museum stash dating to prior to World War I.
8.6 x 7.1 x 6.4 cm. Franklin minerals do not tend to be, very often, what you could call "gemmy." Most phlogopite from there follows this rule of thumb, and although they have fantastic barrel-shaped form, tend to be dark and opaque. This specimen is stunning. It is the quality of gem phlogopite from Afghanistan which we see very rarely come out, but this is from Franklin. It is beautiful, and a significant Franklin specimen, and just a really fine phlogopite crystal by any standard. The crystal is complete all around and measures 3 x 2 x 2 cm. It has been very carefully excavated from calcite matrix to display this robustly atop a natural perch. Ex. Phil Scalisi Collection.
12.4 x 9.1 x 5.5 cm. A large, matrix rhodonite with sharp red crystals in contrasting stark white calcite matrix. The little black crystals are franklinite. The large rhodonite in the middle is 6.5 cm, doubly terminated, tip to tip (though it has a growth interruption in the midpoint). These crystals are sharply terminated, and of high quality, thus. This is an old specimen. Ex. Harvard Museum to Paterson Museum Collection, to George Elling Collection.
STUNNING, DEEP GREEN, EXCEPTIONALLY GEMMY AND BRIGHT emerald crystal measuring 2.5 cm, firmly nestled in crystallized (and notably contrasting) calcite matrix. What is nice about the piece is that the crystal is implanted so thoroughly that there is no question of its authenticity. The color and internal gemminess are extremely high. 5.3 x 3 x 3 cm
8.3 x 6.5 x 4.4 cm. This is a superb calcite specimen from New Jersey. You do not see many this gemmy and so sharp. Ex. Ken Hollman Collection - and note the old label from Charlie Key in his early dealer days in the 1960s or early 1970s.
5.1 x 3.3 x 1.8 cm. I collected calcites for 20 years, since I was a kid, and in all that time I had never seen or been offered such a nice calcite from these classic mines. I obtained it from Herb Obodda in the early 1990s and have had it ever since. It came to him from the Schwethelm collection, in Germany, and probably left the US soon after being mined in the late 1800s. Complete all around, a fine piece I was happy to own for about 15 years in my own collection. Ex. Robert Lavinsky Collection.
12.7 x 10.5 x 6.0 cm. This specimen features two doublet clusters of doubly-terminated willemites, each about 4 cm, flanking a large section of massive calcite matrix. Actually, you can see there are other willemites embedded within. The contrast, when shot with ultraviolet light, is stark and dramatic. This is an old specimen, from the stock of Arthur Montgomery (1909-1999), well known field collector and dealer. His label dates it to (1937-1941). Until recently in the George Elling Collection.
A mesmerizing specimen of classic Tsumeb calcites with sharp, intergrown rhombohedra showing great lustre and translucency! VERY minor, trivial edge wear that frankly could be minimized with a few drops of acid in any case (though I would not do so). 8.3 x 7.3 x 3.3 cm
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Rob Lavinsky, rob@irocks.com
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