General Information:
Chemical Formula:As
Composition:(Molecular Weight = 74.92 gm)Arsenic 100.0 %
As Empirical Formula: As
Environment:Dimorphous with arsenic.
IMA Status:Proposed IMA 1999
Locality:Marienberg, Saxony, Germany.
Name Origin:Named for the composition and the Greek for brilliance, in allusion to its luster.
Physical Properties: Cleavage:[???] Perfect
Color:dark gray.
Density:5.3 - 5.58, Average = 5.44
Diaphaniety:Opaque
Habits:Acicular - Occurs as needle-like crystals., Massive - Uniformly indistinguishable crystals forming large masses.,
Hardness:2 - Gypsum
Luster:Metallic
Streak:black
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