General Information:
Chemical Formula:
NiAs
Composition:
(Molecular Weight = 133.61 gm)
Nickel 43.93 % Ni
Arsenic 56.07 % As
Empirical Formula:
NiAs
Environment:
In ore veins with silver, copper, and nickel arsenides and sulfides.
IMA Status:
Not IMA Approved
Locality:
Cobalt, Ontario.
Name Origin:
Named after its composition.
Physical Properties:
Cleavage:
[1010] Imperfect, [0001] Imperfect
Color:
lead gray, grayish, copper, or black.
Density:
7.78 - 7.8, Average = 7.79
Diaphaniety:
Opaque
Habits:
Massive - Uniformly indistinguishable crystals forming large masses., Reniform - "Kidney like" in shape (e.g.. hematite)., Columnar - Forms columns
Hardness:
5.5 - Knife Blade
Luminescence:
None.
Luster:
Metallic
Streak:
brownish black
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