General Information:
Chemical Formula:
(Mn++,Mg)24Zn3Fe+++(As+++O3)2(As+++++O4)3(SiO4)6(OH)18
IMA Status:
Approved IMA 1978
Physical Properties:
Cleavage:
[0001] Perfect
Color:
copper brown or dark copper brown.
Density:
3.876
Hardness:
3-4 - Calcite-Fluorite
Luster:
Sub Metallic
Streak:
golden brown
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