General Information:
Chemical Formula:
AgCuS
Composition:
(Molecular Weight = 203.48 gm)
Copper 31.23 % Cu
Silver 53.01 % Ag
Sulfur 15.76 % S
Empirical Formula:
CuAgS
Environment:
Copper-silver veins where silver replaces copper in bornite.
Locality:
Butte, Montana, USA.
Name Origin:
Named after the German chemist, F. Stromeyer (1776-1835).
Physical Properties:
Cleavage:
None
Color:
blue gray, dark blue, dark steel gray, or steel gray.
Density:
6 - 6.3, Average = 6.15
Diaphaniety:
Opaque
Habits:
Granular - Generally occurs as anhedral to subhedral crystals in matrix., Massive - Uniformly indistinguishable crystals forming large masses., Pseudo Hexagonal - Crystals show a hexa gonal outline.
Hardness:
2.5-3 - Finger Nail-Calcite
Luminescence:
Non-fluorescent.
Luster:
Metallic
Streak:
steel gray
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