General Information:
Chemical Formula:
NiS
Composition:
(Molecular Weight = 90.76 gm)
Nickel 64.67 % Ni
Sulfur 35.33 % S
Empirical Formula:
NiS
Environment:
In limestone and dolomite cavities.
Locality:
St. Louis, Missouri and Keokuk, Kansas.
Name Origin:
Named after the English mineralogist, W. H. Miller (1801-1880)
Physical Properties:
Cleavage:
[1011] Perfect, [0112] Perfect
Color:
bronze, greenish gray, gray, or brass yellow.
Density:
5.5
Diaphaniety:
Opaque
Habits:
Acicular - Occurs as needle-like crystals., Massive - Uniformly indistinguishable crystals forming large masses.,
Hardness:
3-3.5 - Calcite-Copper Penny
Luminescence:
None.
Luster:
Metallic
Streak:
greenish black
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