General Information:
Chemical Formula:
PbCuSbS3
Composition:
(Molecular Weight = 974.35 gm)
Copper 13.04 % Cu
Tin 12.18 % Sn
Antimony 12.50 % Sb
Lead 42.53 % Pb
Sulfur 19.75 % S
Empirical Formula:
PbPbCuCuSbSnS3
Name Origin:
Named after the French mineralogist, J. L. de Bournon (1751-1825).
Physical Properties:
Cleavage:
[010] Imperfect
Color:
gray, black, or steel gray.
Density:
5.7 - 5.9, Average = 5.8
Diaphaniety:
Opaque
Habits:
Platy - Sheet forms (e.g. micas)., Pseudo Cubic - Crystals show a cubic outline., Cog-wheel - Generally six sided twinned crystals forming Cog-Wheel shapes
Hardness:
3 - Calcite
Luminescence:
None.
Luster:
Metallic
Streak:
gray
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