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Mineral Specimens with Pyrite
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8.3 x 6.8 x 4.7 cm. Really odd, disc-shaped galena crystals to 1 inch surmount a nice knoll of bright pyrite, on this old classic. It is a fine specimen, complete-all-around, and actually quite attractive in person. This is old material from the 1940s-1960s, I am told.
6.2 x 4.3 x 2.6 cm. The Siete Suyos mine (Seven Servants mine) is sometimes considered to be part of the Animas mine, and it is often difficult to know where specimens are from because several mines in the area share the same vein system. I directly obtained this specimen from the miner who collected it, so I know for certain where it came from. This piece features several excellent quality, sharp, lustrous, gemmy, greenish-brown crystals of Siderite measuring up to 1.0 cm which are sitting upon unusual crystals of lustrous Pyrite (which are actually pseudomorphs after Siderite) which are associated with minor grey crystals of the rare sulfide, Stannite. For Siderite, the quality is impressive for Bolivia, as I rarely have seen such sharp and gemmy crystals from any Bolivian locality. So far, this find has been very limited.
11 x 9 x 7 cm. This is one of the finest, most important, large pyrite specimens from Elba that I have seen. Two large, pentagonal dodecahedral (pyritohedral), lustrous, brassy yellow crystals, to 7.0 cm across, are perched high on matrix and associated with minor hematite. The two large crystals are absolutely pristine. Superb in every way, this is a very important classic and a very fine pyrite specimen as well. I have never seen the like, for sale, myself. I am told this is typical of the best material which came out in some special pockets both in the early 1900s and again in a find of the early 1970s. Weighs 1400 grams.
5.4 x 5.2 x 5.0 cm. A very rare, very fine pyrite ball from the less well-known Milpo Mine of Peru. This striking specimen of intergrown pyrite botryoids is highly lustrous and has beautiful, brass-yellow color. Complete-all-around and pristine, this piece has only a small point of attachment at the base. The Atacocha District is much better known for excellent orpiment specimens, so to see a truly fine pyrite from this locale is highly unusual. Ex. Robert Whitmore Collection and this piece undoubtedly dates to the 1970s and early finds out of Peru.
6.3 x 4.4 x 4.3 cm. The Siete Suyos mine (Seven Servants mine) is sometimes considered to be part of the Animas mine, and it is often difficult to know where specimens are from because several mines in the area share the same vein system. I directly obtained this specimen from the miner who collected it, so I know for certain where it came from. This piece features several excellent, sharp, gemmy, greenish-brown crystals of Siderite measuring up to 6.5 mm which are sitting upon an unusual crystal of lustrous Pyrite (pseudomorphs after Siderite) which are associated with minor grey crystals of the rare sulfide, Stannite. For Siderite, the quality is impressive for Bolivia, as I rarely have seen such sharp and gemmy crystals from any Bolivian locality. So far, this find has been very limited.
12.5 x 8.9 x 6.4 cm. This mine has produced some of the best casts after Anhydrite that I've seen from the United States. It is covered with dozens of small pale pink, "rosettes" of Rhodochrosite sitting on white casts of Quartz after Anhydrite with Pyrite crystals. This mine is long defunct and these specimens will no longer be seen except from old collections. A great cabinet-sized specimen of this hard to find and very unique material. Specimens of this size and quality from the Sunnyside are now nearly impossible to find on the market, and will never be mined again. Ex. Richard Kosnar Collection.
2.6 x 1.6 x 1.2 cm. The Henderson mine is a large scale commercial Molybdenum mine on the east slope of the Continental Divide in Colorado. Despite the large amount of mining that takes place underground, there are very few specimens from this mine on the market. The mine is still operating today (2009), but it remains one of the few active mines in Colorado, which is unfortunate as there were well over 100 operating mines in Colorado over 30 years ago. This mine is known for its Rhodochrosite specimens, despite the fact that they are rarely seen on the market these days. This piece hosts a few sharp, pink color, translucent modified rhombohedra of Rhodochrosite measuring up to 1.2 cm with minor Pyrite cubes. This piece was mined approximately 30 years ago, and was one of the few Rhodochrosites from the Henderson in the Colorado collection of Rich Kosnar. From the 8300 Level.
4.0 x 2.8 x 2.1 cm. The Huanzala mine in Peru has produced some of the most attractive and impressive Fluorites from all of South America. The mine has produced both green and pink Fluorites, and even pieces with both colors in the same crystal. These highly modified Fluorite crystals (a combination of cube, octahedron and dodecahedron) have a lovely pale "water green" color with excellent transparency and are associated with lustrous pyritohedral Pyrite crystals. Ex. Richard Kosnar Collection.
9.5 x 6.7 x 4.0 cm. A classic golden scalenohedral Calcite crystal with sharp, lustrous faces and great form. The crystal sits on a matrix of white/grey Dolomite with Pyrite and iridescent Chalcopyrite. Not nearly as common on the market as they once were, and easily some of the most well known American Calcite specimens extant.
4.9 x 3.9 x 2.4 cm. A sharp and jagged "mountain" of iridescent peacock-blue and magenta covellite plates is perched on the sparkly, brassy, pyrite microcrystal-rich matrix on this fine old-time specimen from the East Colusa Mine at Butte. A highly representative example of the species and renowned locale.
9.0 x 6.2 x 4.0 cm. Djurleite is an uncommon copper sulfide closely related to chalcocite. It is very rarely reported and offered from the famous and now-closed mines at Butte. Lustrous, sharp, steel-gray, twinned prisms of djurleite to about 6 mm are richly concentrated in clusters and are complimented by sprays of milky quartz needles and lustrous, brassy pyrite on this superb, old-time specimen from the Steward Mine. Many of the djurleite crystals have interesting, faint, iridescent tarnish. The matrix is mostly pyrite on this specimen. Very seldom available in this richness and quality from this historic locale. Ex. Bill Smith and George Feist (# 2616) Collections and according to the accompanying label, the piece dates to the early 1960s.
7.0 x 5.9 x 5.4 cm. An amazing pyrite concretion from a new Chinese find. This striking, slightly flattened ball of parallel bands of sparkly pyrite microcrystals on shale looks like a hand-woven basket or clay pot inset with pieces of precious metal. The concentration of pyrite on the "lid" has a striking look. A unique and very attractive specimen.
10.4 x 8.7 x 5.2 cm. This pyrite is pristine all around front and sides, contacted only on the back out of view. The quartz is pristine and complete all around. It is 3-dimensional, dramatic, and just plain unique in overall combinatorial aesthetics. I love the secondary intricate faces on the pyrite, and how they reflect light in person to make this appear even more starkly metallic against the contrasting matrix. Gene Schlepp obtained this from the Dr. Miguel Romero Collection in trade. Gene then sold it to Dr. Ed David with whom it has remained.
6.5 x 5.6 x 2.7 cm. Excellent crystals of Tennantite to 2.3 cm with excellent mirror-like luster. Crystals of this size and quality are simply not that common from this district, or anywhere else, for that matter. The matrix is composed of a fine pyrite druse with beautiful quartz crystals intergrown.
7.5 x 6 x 5.5 cm. A lustrous and quite beautiful pyrite specimen composed of sharp octahedrons up to 4 cm on edge, completely formed atop a pedestal of smaller crystals. The tips are modified and show very attractive striations, while the luster is split between mirror-like and attractively etched. This is a superior Pyrite specimen. Not your common quality. It is complete-all-around and stunning.
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Rob Lavinsky, rob@irocks.com
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