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Cuprite

Mineral formula: Cu2O

Crystal system: isometric

Crystal habit: Crystals octahedral or cubic, rarely dodecahedral, sometimes highly modified. In the variety chalcotrichite the crystals are greatly elongated into capillary shapes.

Cleavage: imperfect on {111}

Fracture: conchoidal

Color: dark red to cochineal red, sometimes almost black.

Luster: adamantine, sub-metallic, earthy

Diaphaneity: transparent to translucent

Moh’s scale hardness: 3 ½ - 4

Streak: shining metallic brownish-red

Specific gravity: 6.14

Named after:  the Latin "cuprum," in allusion to its composition in 1845 by Wilhelm Karl von Haidinger The mineral had been known under a variety of names; Haidinger renamed it.

Geological occurrence: Cuprite is commonly found as an oxidation product of copper sulphides in the upper zones of veins, often associated with native copper, malachite, azurite, limonite and chalcocite.

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