General Information:
Chemical Formula:(Cu,Fe)12As4S13
Composition:(Molecular Weight = 1,479.10 gm)Copper 51.56 %
CuArsenic 20.26 %
AsSulfur 28.18 %
S Empirical Formula: Cu12As4S13
Name Origin:Named after the English chemist, S. Tennant (1761-1815).
Physical Properties: Cleavage:None
Color:steel gray or black.
Density:4.6 - 4.7, Average = 4.65
Diaphaniety:Opaque
Habits:Massive - Granular - Common texture observed in granite and other igneous rock., Massive - Uniformly indistinguishable crystals forming large masses., Disseminated - Occurs in small, distinct particles dispersed in matrix.
Hardness:3.5-4 - Copper Penny-Flourite
Luminescence:None.
Luster:Metallic
Streak:reddish gray
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