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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