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Mineral Specimens with Fluorite
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15.2 x 10.5 x 6.0 cm. Emplaced on a very 3-dimensional limestone matrix is a plate of glassy and gemmy, light golden-yellow fluorite crystals to 1 cm across. These crystals are enhanced by a preferential drusy coating of ivory colored calcite on the fluorites, on certain faces only, which gives a slight but important accent in the form of a winding ribbon, to the overall geometry of the piece. A superb example from this classic locality. This is from a private collection in Spain, accumulated over decades.
19.3 x 11.7 x 7.8 cm. Three generations of crystallization have occurred on this limestone matrix. The first to form was a plate of lustrous and translucent, amber-colored crystals of fluorite, to .5 cm across. Next to form were clusters of intergrown, saddle-shaped, ivory colored calcite. The third generation resulted in large, lustrous and translucent, ivory colored rhombohedrons of calcite, to 6.5 cm across - including one big crystal perched right at the apex of the specimen; and, remarkably not only is it complete 360 degrees around, but it is pristine. Aside from any locality value, this is therefore an interesting specimen with fascinating paragenesis. Very nice color and sculptural contrast make this one of the better large examples from this famous locality, and quite distinct in its combination from calcite of other locales. In fact, it is very similar to material from old quarries in Shullsberg, Wisconsin - but those of course do not grow on fluorite. This is from a private collection in Spain, accumulated over decades.
10.4 x 7.2 x 4.1 cm. This specimen is from a find of fall 2008. The color, lustre, and transparency of these crystals is above average for Chamonix, more of a vibrant pink-red than the usual muted pink hues we have seen in most pockets of these rare Alpine fluorites. This specimen has crystals to 4.25 cm, perched on a slender shard of white, crystallized adularia (feldspar) matrix. It is a stunning association, and contrast. The crystals here climb up the shard, one atop the other. Note how gemmy and translucent the top crystal is. It has a termination that is complete all around, 360 degrees. The piece itself, actually, is also complete all around the backside, if somewhat roughly crystallized compared to the front. The crystals all wrap around and have sharp edges as well.
5.9 x 4.4 x 3.9 cm. This specimen is from a find of fall 2008. The color, lustre, and transparency of these crystals is above average for Chamonix, more of a vibrant pink-red than the usual muted pink hues we have seen in most pockets of these rare Alpine fluorites. This specimen has crystals to 2 cm, perched on stark white, crystallized adularia (feldspar) matrix. It is a stunning association, and contrast. The crystals here are piled up, one atop the other. Note how gemmy and translucent the top crystal is. It has a termination that is complete all around, 360 degrees.
6.0 x 4.9 x 3.3 cm. This specimen is from a find of fall 2008. The color, lustre, and transparency of these crystals is above average for Chamonix, more of a vibrant pink-red than the usual muted pink hues we have seen in most pockets of these rare Alpine fluorites. This particular specimen features sharp and gemmy, transparent crystals to 2.7 cm. They are vibrantly lustrous - better in person. The crystals are perched on stark white, crystallized adularia (feldspar) matrix. It is a stunning association and contrast. The crystals here are piled up, one atop the other. Note that the apex crystal has a termination that is complete all around, 360 degrees.
20.3 x 16.0 x 9.3 cm. Around 2004-2005, a friend of mine collected a large quantity of these beautiful green fluorites from a small new prospect in the well-known Grant County area of New Mexico. Most fluorite from this region is purple or mixed shades of purple and green, intermixed. I had never seen specimens of this pure green hue, much less large ones, from here. This piece, at over 2 kilograms, was one of the best and largest examples he brought out at the time. It is a beautiful piece, with good 3-dimensional coverage all over the matrix, and it sits naturally upright on its own.
7.3 x 3.9 x 3 cm. These beautiful specimens are rare survivors of a small find that produced great carving rough for cabochons and jewelry made of chalcedony (it’s gemmy and transparent/translucent). Charlie Key saved some from the wrecker, though, and this specimen is from a flat of this rare and beautiful old material from the 1980s. This one is particularly nice because it is a good-sized plate with excellent translucency and good horizons about the edge.
9.8 x 5 x 4.1 cm. Transparent, light purple, fluorite cubes with exquisite stepped faces, appear to be dusted with white mm size calcite crystals. The two large, equant crystals are each 2 cm across and they exhibit wonderful luster. Internally, the piece is totally gemmy. Ex. Ernie Schlichter Collection.
14.0 x 10.0 x 8.3 cm. An incredible large specimen with bi-colored fluorite crystals, to 4.0 cm across perched on splendent, black sphalerite crystals to 1.5 cm. The fluorite crystals exhibit both pastel green and pastel lavender colors - and intense saturation as well. The crystals are gemmy and transparent. The gemmier cubes are modified by octahedral faces.
14.7 x 10.6 x 8.0 cm. A beautiful combination piece. This has clusters of gemmy, bi-colored fluorite crystals, to 3.0 cm across, exhibiting both pastel green and pastel lavender hues. The crystals are cubes modified by octahedral faces. There are also two clusters of lustrous, black sphalerite to 3.5 cm across perched among the fluorite crystals. As an added effect, there is a thin drusy crust of white quartz draped over both the fluorite and sphalerite. All of this is underlain by a matrix of galena, sphalerite and pyrite.
15.5 x 11.7 x 7.8 cm. The sculptural quality and aesthetics of this specimen are exquisite. Massive, black sphalerite is the matrix for gemmy, bi-colored, pastel green and pastel lavender fluorite crystals, to 4.5 cm across. Color is very rich for Naica. These are cubes with modifying octahedral faces. They also exhibit stepped growth. One incredible characteristic of this specimen is that the back side of the fluorite came off the pocket wall and was later re-healed with some growth over the contacted face there, making this technically a floater with no open attachment points.
5.3 x 4.0 x 3.5 cm. This fantastic crystal is transparent and sharp as can be wished for, complete except for a small contact in the back. Aesthetically perched on a matrix of splendent, black sphalerite, are two equant, gemmy, pastel lavender fluorite crystals. The large one atop is about 3 cm across. The fluorite crystals are cubes modified by octahedral faces, classic for Naica.
8.6 x 7.2 x 5.5 cm. Gemmy, bi-colored, fluorite crystals, to 3.0 cm across, are perched on a matrix of splendent galena crystals to 2.0 cm in length. The core of the fluorite crystals is pastel green and the terminal faces are pastel lavender. There is also evidence of the stepped growth, for which Naica is famous.
8.1 x 7.7 x 5.3 cm. This matrix specimen has fine aesthetics thanks to well formed lustrous galena crystals, to 2.5 cm in length, upon which are emplaced gemmy, pastel green fluorite crystals, to 3.0 cm across. The contrast of form and color with the galena is superb. The fluorite crystals are cubes with modifying octahedral faces. In addition, there is a drusy crust of white quartz partially covering the lower boundary with the galena crystals for accent.
12.0 x 10.8 x 7.5 cm. Of all the fluorite specimens with galena in this update this is clearly the most dramatic. It is a very heavy, 3-dimensional specimen with a herd of gem fluorites stampeding off the top at you as the viewer, really 3-dimensionally coming off the galena. The lustrous galena crystals to 1.7 cm across are surmounted by gemmy, pastel green and lavender, fluorite crystals to 3.5cm across. Fluorite cubes are modified by octahedral faces and there is also the presence of stepped growth.
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Rob Lavinsky, rob@irocks.com
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share specimen![Fluorite from Moscona Mine, Solís, Llanera, Villabona mining area, Asturias, Spain [db_pics/mdpics/MD-224124a.jpg]](db_pics/mdpics/MD-224124a.jpg)
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