General Information:
Chemical Formula:
Pb2Mn+++2Si2O9
Composition:
(Molecular Weight = 724.44 gm)
Manganese 15.17 % Mn
Silicon 7.75 % Si
Lead 57.20 % Pb
Oxygen 19.88 % O
Empirical Formula:
Pb2Mn3+2Si2O9
Locality:
Vermland, Sweden.
Physical Properties:
Cleavage:
[110] Distinct
Color:
dark reddish brown or reddish black.
Density:
6.19
Diaphaniety:
Translucent to subtranslucent
Habits:
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline)., Crystalline - Fine - Occurs as well-formed fine sized crystals., Wheat Sheaf - Bundle shaped aggregates resembling wheat sheafs after hand reaping wheat.
Hardness:
5 - Apatite
Luster:
Sub Metallic
Streak:
dark brown
More details...