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
More details...