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Dominant species
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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.
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