General Information:
Chemical Formula:
Ag16As2S11
Composition:
(Molecular Weight = 2,228.46 gm)
Silver 77.45 % Ag
Arsenic 6.72 % As
Sulfur 15.83 % S
Empirical Formula:
Ag16As2S11
Environment:
The arsenical analog of polybasite.
Locality:
Aspen, Colorado.
Name Origin:
Named after the American chemist, R. Pearce (1837-1927).
Physical Properties:
Cleavage:
[001] Poor
Color:
black.
Density:
6.13
Diaphaniety:
Opaque
Habits:
Massive - Granular - Common texture observed in granite and other igneous rock., Granular - Generally occurs as anhedral to subhedral crystals in matrix.,
Hardness:
2.5-3 - Finger Nail-Calcite
Luminescence:
None.
Luster:
Sub Metallic
Streak:
reddish black
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