General Information:
Chemical Formula:
(Mn,Fe++)16Si12As+++3O36(OH)17
Environment:
Dimorphous with schallerite.
IMA Status:
Approved IMA 1982
Physical Properties:
Cleavage:
[001] Perfect
Color:
brown.
Density:
3.46
Diaphaniety:
Transparent to Translucent
Hardness:
5 - Apatite
Luster:
Vitreous (Glassy)
Streak:
light brown
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