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Dominant species
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Tetradymite
Chemical
Formula
Bi2Te2S
Species
Sulfides
Crystal
System
Trigonal
Mohs
Scale
1-2
Specific
Gravity
7.2-7.9
Color
Steel-gray with dull to iridescent tarnish; white in polished section
Streak
Steel-gray
Luster
Metallic, Dull
Diaphaneity
Opaque
Cleavage
Perfect on
Fracture
Uneven
Crystal Habit:Pyramidal prisms, commonly granular, massive to foliated, also bladed
Tetradymite2508
Tetradymite2508
Tetradymite2504
Tetradymite2504
Tetradymite2498
Tetradymite2498
Tetradymite2493
Tetradymite2493
Tetradymite2491
Tetradymite2491
Tetradymite2488
Tetradymite2488
Tetradymite2485
Tetradymite2485