General Information:
Chemical Formula:Pb2Mn+++2Si2O9
Composition:(Molecular Weight = 724.44 gm)Manganese 15.17 %
MnSilicon 7.75 %
SiLead 57.20 %
PbOxygen 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
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