General Information:
Chemical Formula:Cu+Mn++14Fe+++(As+++O3)5(SiO4)2(As+++++O4)(OH)6
Composition:(Molecular Weight = 1,928.25 gm)Manganese 39.89 %
MnIron 2.90 %
FeCopper 3.30 %
CuSilicon 2.91 %
SiArsenic 23.31 %
AsHydrogen 0.31 %
H Oxygen 27.38 %
O Empirical Formula: CuMn2+14Fe3+(AsO3)5(SiO4)2(AsO4)(OH)6
Locality:Langbanshyttan, Vermland, Sweden.
Physical Properties: Cleavage:[001] Perfect
Color:bronze or black.
Density:4.2
Diaphaniety:Translucent to subtranslucent to opaque
Habits:Foliated - Two dimensional platy forms., ,
Hardness:3-4 - Calcite-Fluorite
Luster:Vitreous (Glassy)
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