|TETRHEDRITE MINERAL FACTS|
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Tetrahedrite Mineral Facts:
Chemical Formula: Cu12Sb4S13
Colors: Usually steel gray to iron black. Very thin splinters appear cherry red by transmitted light.
Hardness: 3 to 4.5
Density: 4.6 to 5.1
Cleavage: One poor cleavage on 0001. Fracture is conchoidal and uneven: brittle.
Luster:. Metallic and opaque, except on thin edges as noted.
Optics: (Refractive Index) = Opaque
Composition, Structure and
Found in metallic veins usually associated with chalcopyrite, pyrite, sphalerite, galena and various other silver, lead and copper ores. May carry sufficient silver to become an important ore of that metal (the highly argentiferous variety is known as freibergite). Tetrahedrite appears to suffer alteration quite readily, since pseudomorphs of several carbonates and sulfides after tetrahedrite crystals are well known.
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Please note that the author, Chris Ralph, retains all copyrights to this entire document and it may not be reproduced, quoted or copied without permission.
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