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Mineral Specimens with Pyrite
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13.4 x 11.4 x 2.6 cm. A rather unusual large plate of bournonite crystals, all showing sharp UNTWINNED crystals to 2.25 cm in size.
3.7 x 3.1 x 2.7 cm. This fine miniature features razor sharp, lustrous crystals to just over 1 cm beautifully set upon a miniature-sized matrix of pyrite. The crystals have a slight purple sheen to the surface.
3.9 x 2.4 x 1.7 cm. This is a gemmy, translucent blue daisy-chain of intergrown sharp scorodite crystals, a floater complete all around.
3.5 x 2.9 x 2.4 cm. A sculptural, floater cluster of intergrown scorodite of several habits, including a sharp, symmetric "bipyramidal" crystal to 2 cm in the middle, and more "pseudocubic" crystals to 1.25 cm around the periphery. The crystals are not opaque, but when backlit a faint purple hue, and somewhat translucent. Lustre is high and reflective.
5.8 x 4.2 x 3.5 cm. This is one of the more colorful specimens, of classical blue scorodite compared to the purple and darker hues predominant at this locality. Crystals are glassy in lustre, sharp, and reach 9mm in size.
4.1 x 2.7 x 2.0 cm. A central crystal of about 1.5 cm serves as the pivot for this aesthetic cluster of sharp scorodites accented by bright pyrite crystals. The crystals have variously a blue or blue-green surface sheen and are high in luster
3.3 x 3.0 x 2.1 cm. An extremely rare, fine single crystal showing iron cross twinning in pyrite. Ex. Gene Meieran Collection.
5.4 x 4.8 x 4.6 cm. This is an old Bisbee variscite, and a super-rich and solid one. There is just a small amount of matrix here - this is almost all blue-green variscite. Weighs 165 grams.
7.4 x 4.9 x 4.9 cm. A 4.5-cm calcite crystal, with purplish hues from inclusions of hematite, leaning out from a plate of oxidized sulfides, covered with sparkly pyrites and layered with more calcite and pyrite. The hematite inclusions here and there spread the purplish hue around. George Feist Collection.
13.7 x 7.5 x 4.8 cm. An impressive cabinet specimen with a heavy mat of hair-like, metallic-bright boulangerite needles on sulfide matrix highlighted by lustrous, brass-yellow pyritohedrons. Ex. Ed Ruggiero Collection.
10.0 x 9.0 x 4.5 cm. A superb cabinet specimen of a water-clear, glassy quartz crystal beautifully coated with sparkly pyrite microcrystals and attended to by highly lustrous, tabular/blocky wolframite crystals and smaller quartz crystals. Ex. Cal Graeber and Dave & Emily Stoudt Collections.
6 x 3.5 x 2.4 cm. A fine specimen comprised of a Bornite-coated Chalcopyrite crystal nestled in a bed of clear Quartz crystals and superb lustrous Pyrite crystals. The Bornite-coated crystal is up to 1.5 cm across. Ex. Charlie Key.
8 x 6.4 x 4.2 cm. A sharp and distinctive twinned Chalcopyrite nestled among a forest of varying size Quartz crystals. The Chalocpyrite has a fabulous iridescent luster, and is over 3 cm long. Below the Quartz is more Chalcopyrite, Sphalerite, and Pyrite. Ex. Charlie Key.
5.7 x 4.5 x 2.8 cm. Tabular, iridescent, purplish-blue, crystals of covellite to 2.5 cm across are associated with bright, golden, pyrite crystals.
5.8 x 4.7 x 4.3 cm. These were mined prior to 1850. This beautiful and historic specimen is composed of roseate crystals of radiating covellite that are partially coated by a druse of secondary pyrite. The iridescent, neon blue color along with the lustrous pyrite and rosette form makes this a superb specimen.
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Rob Lavinsky, rob@irocks.com
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share specimen![Bournonite, Quartz, Pyrite from Machacamarca Mine, Machacamarca, Machacamarca District (Colavi District), Cornelio Saavedra Province, Potosí Department, Bolivia [db_pics/mdpics/MD-176868a.jpg]](db_pics/mdpics/MD-176868a.jpg)
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