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Sphalerite, over 100 Carats, Santander, Spain Sphalerite, a zinc iron sulfide, is usually found in black and very rarely in the rich orange color seen here—and it is rarely seen cut into a gemstone. The luster of sphalerite is its strongest attribute, i.e. it is adamantine, with a high refractive index and brilliance greater than diamonds.

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Sphlarite. Fancy Cut Gem. Sphalerite is the chief ore of zinc. It consists largely of zinc sulfide in crystalline form but almost always contains variable iron. When iron content is high it is an opaque black variety, marmatite. It is usually found in association with galena, pyrite, and other sulfides along with calcite, dolomite, and fluorite. Miners have also been known to refer to sphalerite as zinc blende, black-jack, and ruby jack.

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Sphalerite is the chief ore of zinc. It consists largely of zinc sulfide in crystalline form but almost always contains variable iron. When iron content is high it is an opaque black variety, marmatite. It is usually found in association with galena, pyrite, and other sulfides along with calcite, dolomite, and fluorite. Miners have also been known to refer to sphalerite as zinc blende, black-jack, and ruby jack.

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Sphalerite is simply zinc sulfide, but often makes for great crystals with a deep red brown color. For better contrast quarz and calcite crystals are sprinkled among them. From Stan Terg Mine, Kosovo.

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Sphalerite ((Zn,Fe)S) is a mineral that is the chief ore of zinc. It consists largely of zinc sulfide in crystalline form but almost always contains variable iron

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A cute thumbnail showing a honey coloured twinned crystal of sphalerite overgrown by multicoloured chalcopyrite on a matrix of snowy white dolomite.

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SPHALERITE and QUARTZ (Zinc Sulfide ans Silicon Dioxide) from Alimon Mine, Huaron District, Peru. Small quartz crystals sit on sphalerite.

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