General Information:
Chemical Formula:
Pb2Fe+++2Si2O9
Composition:
(Molecular Weight = 726.26 gm)
Iron 15.38 % Fe
Silicon 7.73 % Si
Lead 57.06 % Pb
Oxygen 19.83 % O
Empirical Formula:
Pb2Fe3+2Si2O9
Environment:
Occurs with native lead.
Locality:
Langbanshyttan, Vermland, sweden.
Physical Properties:
Cleavage:
[???] Good
Color:
black or blackish gray.
Density:
5.73
Diaphaniety:
Subtranslucent to opaque
Habits:
Massive - Uniformly indistinguishable crystals forming large masses., Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).,
Hardness:
6.5 - Pyrite
Luminescence:
Non-fluorescent.
Luster:
Sub Metallic
Streak:
greenish
More details...