General Information:
Chemical Formula:
(Ag,Cu)16Sb2S11
Composition:
(Molecular Weight = 2,144.83 gm)
Copper 11.85 % Cu
Silver 60.35 % Ag
Antimony 11.35 % Sb
Sulfur 16.45 % S
Empirical Formula:
Ag12Cu4Sb2S11
Name Origin:
From the Greek, poly, "many" and basis, "a base" in allusion to the basic character of the compound.
Physical Properties:
Cleavage:
[001] Poor
Color:
black or dark ruby red.
Density:
4.6 - 5, Average = 4.8
Diaphaniety:
Opaque
Habits:
Massive - Granular - Common texture observed in granite and other igneous rock., Granular - Generally occurs as anhedral to subhedral crystals in matrix., Pseudo Hexagonal - Crystals show a hexagonal outline.
Hardness:
2.5-3 - Finger Nail-Calcite
Luminescence:
None.
Luster:
Sub Metallic
Streak:
reddish black
More details...