General Information:
Chemical Formula:
Bi2Te2S
Composition:
(Molecular Weight = 705.23 gm)
Bismuth 59.27 % Bi
Tellurium 36.19 % Te
Sulfur 4.55 % S
Empirical Formula:
Bi2Te2S
Name Origin:
From the Greek, tetradymos, "fourfold."
Physical Properties:
Cleavage:
[0001] Perfect
Color:
steel gray or yellow gray.
Density:
7.2 - 7.9, Average = 7.55
Diaphaniety:
Opaque
Habits:
Lamellar - Thin laminae producing a lamellar structure., Granular - Generally occurs as anhedral to subhedral crystals in matrix., Pseudo Hexagonal - Crystals show a hexagonal outline .
Hardness:
1.5-2 - Talc-Gypsum
Luminescence:
None.
Luster:
Metallic
Streak:
steel gray
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