Tennantite | |
Chemical Formula |
Cu12As4S13 |
Species |
Sulfides |
Crystal System |
Isometric |
Mohs Scale |
3-4 |
Specific Gravity |
4.65 |
Color |
Flint-gray to iron-black, cherry-red in transmitted light |
Streak |
reddish gray |
Luster |
Metallic |
Refractive Index |
n greater than 2.72 |
Diaphaneity |
Opaque |
Cleavage |
None |
Fracture |
Sub-Conchoidal |
Crystal Habit:massive to well formed crystals | |
Geological Setting:Hydrothermal veins and contact metamorphic deposits. |