General Information:
Chemical Formula:(Co,Fe)AsS
Composition:(Molecular Weight = 165.15 gm)Iron 8.45 %
FeCobalt 26.76 %
CoArsenic 45.37 %
AsSulfur 19.42 %
S Empirical Formula: Co0.75Fe2+0.25AsS
Locality:COBALT GRANT
Physical Properties: Cleavage:[010] Perfect, [101] Distinct
Color:gray or silver white.
Density:5.9 - 6.01, Average = 5.95
Diaphaniety:Opaque
Habits:Massive - Uniformly indistinguishable crystals forming large masses., ,
Hardness:5 - Apatite
Luminescence:Non-fluorescent.
Luster:Metallic
Streak:black
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