General Information:
Chemical Formula:
(Cu,Fe)12As4S13
Composition:
(Molecular Weight = 1,479.10 gm)
Copper 51.56 % Cu
Arsenic 20.26 % As
Sulfur 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
More details...