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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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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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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 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.

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 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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These Radioactive Elements Actually Do Glow in the Dark

These Radioactive Elements Actually Do Glow in the Dark: This is a glowing radium painted dial from the 1950s. Radium doesn't really glow, but it emits radiation that causes phosphorescence in doped zinc sulfide.

How to Make Glow-in-the-Dark Paint at Home

Glow-in-the-dark paint livens up any craft project and also teaches kids about fluorescence and phosphorescence. Using luminous zinc sulfide powder, you can mix up all different kinds of glow-in-the-dark paint, from water-based paint to fabric paint and from clear paint to colored paint. There are no harmful chemicals, and the paint will glow again...