General Information:
Chemical Formula:
(Mg,Mn++)Mn++++3O7·3(H2O)
IMA Status:
Approved IMA
Physical Properties:
Color:
brown or brownish black.
Density:
3.6
Diaphaniety:
Opaque
Hardness:
1.5-2 - Talc-Gypsum
Luster:
Metallic
Streak:
brown
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