General Information:
Chemical Formula:
PtAs2
Composition:
(Molecular Weight = 344.92 gm)
Arsenic 43.44 % As
Platinum 56.56 % Pt
Empirical Formula:
PtAs2
Environment:
Magmatic, in basic pegmatites, and alluvial.
Locality:
Tweefontein, Republic of South Africa.
Name Origin:
Named after its discoverer, the Candian chemist, Francis L. Sperry.
Physical Properties:
Cleavage:
[001] Indistinct
Color:
tin white.
Density:
10.58
Diaphaniety:
Opaque
Habits:
Disseminated - Occurs in small, distinct particles dispersed in matrix., Crystalline - Fine - Occurs as well-formed fine sized crystals.,
Hardness:
6-7 - Orthoclase-Quartz
Luminescence:
None.
Luster:
Metallic
Streak:
black
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