General Information:
Chemical Formula:
(Bi,Pb)3(Se,S)4
Composition:
(Molecular Weight = 894.11 gm)
Bismuth 46.75 % Bi
Lead 23.17 % Pb
Selenium 26.49 % Se
Sulfur 3.59 % S
Empirical Formula:
Bi2PbSe3S
Environment:
Discredited as being a mixture of laitakarite and selenian galena.
IMA Status:
Discredited IMA 1999
Locality:
Falun, Dalecarlia, Sweden.
Name Origin:
Named from the Greek "to broaden", in allusion to its platy habit.
Physical Properties:
Cleavage:
[001] Good, [010] Good, [100] Good
Color:
gray, black, or white.
Density:
7.98
Diaphaniety:
Opaque
Habits:
Platy - Sheet forms (e.g. micas)., ,
Hardness:
2-3 - Gypsum-Calcite
Luster:
Metallic
Streak:
shining black
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