General Information:
Chemical Formula:Cu4(As,Sb)2S5
Composition:(Molecular Weight = 592.45 gm)Copper 42.90 %
CuAntimony 12.33 %
SbArsenic 17.70 %
AsSulfur 27.06 %
S Empirical Formula: Cu4As1.4Sb0.6S5
Environment:Hydrothermal veins.
IMA Status:Approved IMA
Locality:Teine mine, Sapporo, Hokkaido, Japan.
Name Origin:Named for Takeo Watanabe, (1907-1986), Japanese mineralogist.
Physical Properties: Cleavage:None
Color:lead gray or silver gray.
Density:4.66
Diaphaniety:Opaque
Habits:Microscopic Crystals - Crystals visible only with microscopes., Anhedral Grains - Granular minerals without the expression of crystal shapes,
Hardness:4-4.5 - Between Fluorite and Apatite
Luster:Metallic
Streak:lead gray
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