General Information:
Chemical Formula:
Mn++6(W++++++,Mg)2Si2(O,OH)14
IMA Status:
Approved IMA 1967
Physical Properties:
Color:
brown or reddish black.
Density:
4.47
Diaphaniety:
Transparent to Translucent
Hardness:
4 - Fluorite
Luster:
Resinous
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