General Information:
Chemical Formula:
(Mn,Mg,Al)15(AsO3)(AsO4)2(OH)23
Physical Properties:
Cleavage:
[0001] Perfect
Color:
blood red, brown red, black, or black red.
Density:
3.49
Diaphaniety:
Translucent to Subopaque
Hardness:
3.5 - Copper Penny
Luster:
Vitreous - Pearly
Streak:
brown red
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