Tenorite | |
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General | |
Category | Oxide mineral |
Formula (repeating unit) | CuO |
IMA symbol | Tnr[1] |
Strunz classification | 4.AB.10 |
Crystal system | Monoclinic |
Crystal class | Prismatic (2/m) (same H-M symbol) |
Space group | C2/c |
Unit cell | a = 4.6837(5) Å b = 3.4226(5) Å c = 5.1288(6) Å; β = 99.47°; Z = 4 |
Identification | |
Color | Steel-gray, iron-gray, black |
Crystal habit | Lathlike crystals, curved, scaly, dendritic; commonly pulverulent, earthy, massive |
Twinning | Common on {011}, forming stellate groups; lamellar |
Cleavage | Poor to indistinct |
Fracture | Conchoidal to uneven |
Tenacity | Brittle; flexible and elastic in thin scales |
Mohs scale hardness | 3.5–4 |
Luster | Metallic to earthy |
Streak | Black |
Diaphaneity | Opaque, thin flakes transparent |
Specific gravity | 6.5 |
Optical properties | Biaxial (+) |
Pleochroism | Distinct; light to dark brown |
References | [2][3][4] |
Tenorite, sometimes also called Black Copper, is a copper oxide mineral with the chemical formula CuO. The chemical name is Copper(II) oxide or cupric oxide.