Pararammelsbergite

General Information:
 Chemical Formula:
NiAs2
 Composition:
(Molecular Weight = 208.53 gm)
Nickel 28.14 % Ni
Arsenic 71.86 % As
 Empirical Formula:
NiAs2
 Name Origin:
From the Greek, para -"similar" and the mineral Rammelsbergite named after the German chemist and mineralogist, K. F. Rammelsberg (1813-1899).
Physical Properties:
 Cleavage:
[001] Perfect
 Color:
silver white or tarnished white.
 Density:
7.2
 Diaphaniety:
Opaque
 Habits:
Massive - Granular - Common texture observed in granite and other igneous rock., Platy - Sheet forms (e.g. micas)., Arborescent - "Tree like" growths of branched systems (e.g. silver) .
 Hardness:
5.5 - Knife Blade
 Luster:
Metallic
 Streak:
grayish black
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