General Information:
Chemical Formula:
(Mg,Mn++)2Mn+++BO5
Composition:
(Molecular Weight = 209.67 gm)
Magnesium 17.39 % Mg
Manganese 39.30 % Mn
Boron 5.16 % B
Oxygen 38.15 % O
Empirical Formula:
Mg1.5Mn2+0.5Mn3+BO5
IMA Status:
Approved IMA 1960
Physical Properties:
Cleavage:
[010] Good
Color:
black.
Density:
4.03
Diaphaniety:
Opaque
Hardness:
6 - Orthoclase
Luster:
Metallic
Streak:
brown gray
More details...