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Mineral Specimens with Sphalerite
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6.5 x 5.6 x 4.2 cm. A gorgeous spray of lightly frosted quartz crystals is very aesthetically perched on lustrous, jet-black sphalerite crystals on this fine combination piece from Naica, Mexico and the Jaime Bird Collection. Jaime bought this piece in 1975. Classic Naica material.
4.4 x 2.8 x 2.2 cm. From a newly opened vein in the Animas mine, this piece is a nice crystal group of greyish-black Sphalerite. It has an almost velvety luster in areas when rotated in the light. The piece is essentially opaque, but I have not seen any specimens from this area for a long time, and hopefully it will start producing more pieces in the future.
8.2 x 6.4 x 4.7 cm. A large, very rich specimen of sharp, modified Tetrahedrite crystals from Peru. These crystals, often intergrown or sprinkled with showy brassy Chalcopyrite, measure to .9 cm along the edge. The Tetrahedrites have superb luster and have fascinating modifications on the faces and edges. All rest on massive Sphalerite, and there are several large, intergrown Sphalerite crystals, as well. Ex. Charlie Key.
8.4 x 6.4 x 5.1 cm. Four sharp, moderately lustrous, isolated galena octahedrons to 1.4 cm are aesthetically set on silicified limestone matrix dusted with ruby-jack sphalerite microcrystals on this classic, old-time specimen from Picher, Oklahoma. Ex. New York State Museum and George Feist Collection # 2939.
3.5 x 2.2 x 1.6 cm. This specimen consists of scalenohedral Manganoan Calcite crystals with a soft pink hue which are associated with minor brownish-black Sphalerite. The Calcite is translucent when backlit and the overall aesthetics of the piece make it a very good display specimen of this truly classic San Juan material. The Idarado mine is most famous for it's Manganoan Calcite specimens. In fact, the largest quantity of the finest quality Manganoan Calcite specimens from Colorado were found in this mine. Ex. Richard Kosnar Collection.
6.8 x 6.7 x 3.0 cm. From the find from about 7 years ago (2002), this is a piece from that great find at the Estano Orcko mine. This small cabinet size specimen features a few good-size, relatively sharp, dark, lustrous, modified dodecahedra of Sphalerite associated with pyritohedral crystals of Pyrite and acicular crystals of Jamesonite. The Sphalerite crystals have a very slight unusual "peacock blue-green" patina which is actually a Bornite "wash" that is seen on practically every specimen from this find.
5.5 x 4 x 3 cm. Sharp, lustrous crystals of sphalerite to 1.3 cm across, perched on golden siderite. The crystal is really quite brilliant - better in person. This locality is of course classic for the world-renowned galenas, but I would guess sphalerite is just as uncommon if not more so. This is certainly an old specimen. The label with it dates it to 1955, but I would assume it was mined long before. Still, the exact mine name was preserved which is unusual and nice to know.
4.5 x 3.8 x 3.5 cm. From a small find that was brought out at the 2006 Munich Show. These are very unusual crystals in that they are hollow casts after calcite, and the coating is a true mixture of sphalerite and siderite. They have been extensively analyzed in South Africa, to come up with this conclusion. So far as I am aware, this is a first. This one is a complete crystal, all-around, very 3-dimensional (more so in person).
7.0 x 6.3 x 4.9 cm. From a small find that was brought out at the 2006 Munich Show. These are very unusual crystals in that they are hollow casts after calcite, and the coating is a true mixture of sphalerite and siderite. They have been extensively analyzed in South Africa, to come up with this conclusion. So far as I am aware, this is a first. This one is a complete crystal, all-around, very 3-dimensional (more so in person). This specimen is one of the better clusters I saw, for the size, and has a wonderful surface sheen and shimmer to it, much more evident and almost golden, in person.
12.9 x 12.4 x 5.4 cm. A classic cabinet combination specimen from the Tri-State District of Kansas. Sharp, moderately lustrous, battleship-gray galena cubes to 3.7 cm are scattered on the silicified limestone matrix plate covered with dolomite rhombs. Complimenting the galena cubes are ruby-jack sphalerite crystals to 2.5 cm, an interesting, brecciated matrix fragment and a dusting of sparkly marcasite crystals. Old-time and excellent, large combination material from this renowned locale.
8.4 x 8.2 x 5.4 cm. A fine Elmwood combination specimen. A 2.4 cm, metallic-bright, etched galena cube is beautifully centered in a rosette-like cluster of very highly lustrous ruby-jack sphalerite crystals. Excellent combination material from this famous and now-closed mine.
6.9 x 6.6 x 4.9 cm. Sparkling ruby-jack sphalerite microcrystals preferentially and richly dust two intergrown fluorite cubes from the Elmwood Mine. The translucent cubes are very faintly yellow and have faint purple highlights and the lustrous, stepped-growth faces have a striking, cross-hatched pattern. Top it off with the ruby-jack sphalerites and you have a very fine specimen from this renowned locale. Nearly colorless fluorites, such as this, are not that common from Elmwood.
11.8 x 10.8 x 7.3 cm. A beautiful, classic, large calcite crystal on sphalerite with a bit of baryte from the Elmwood Mine. This gemmy and lustrous, amber crystal is actually doubly terminated on the lower left side. The primary termination is very sharp, gemmier and has more intense golden color. This termination is essentially pristine. Ex. Consie Prince Collection.
7.5 x 5.1 x 2.9 cm. This is a very distinctive Creede Sphalerite specimen. The Sphalerite crystals are very gemmy with the typical honey and green color that one is accustomed to seeing from this mine, but the fact that the crystals are on pale purple Amethyst, which is rarely seen in the mineral world. The Sphalerite on the Amethyst certainly makes for a nice contrast. You do not see these specimens any more, and they are some of the most classic pieces from any ore body in Colorado. This piece came from the Richard A. Kosnar collection and was mined in 1957 by Bob Hartman. From the OH vein.
10.9 x 7.2 x 5.0 cm. A very fine, well-crystallized cabinet specimen from Dal’negorsk. The lustrous galena crystals, to 3.5 cm, appear to be naturally etched or have the "melted look". The large galena is hoppered. Richly scattered are sharp, lustrous, blocky, black, twinned sphalerite crystals to 3.1 cm. Nearly complete-all-around, this is exceptionally free of damage. Said to have been mined in September, 2002. Ex. Minette Collection # WW559 with data card.
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Rob Lavinsky, rob@irocks.com
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