General Information:
Chemical Formula:
Mg2Mn+++O2(BO3)
Composition:
(Molecular Weight = 253.16 gm)
Magnesium 19.20 % Mg
Manganese 21.70 % Mn
Boron 8.54 % B
Oxygen 50.56 % O
Empirical Formula:
Mg2Mn3+O2(BO3)
Environment:
In dolomite.
IMA Status:
Approved IMA 1980
Locality:
Lanban, Varmland, Sweden.
Name Origin:
Named for Yoshio Takeuchi (1924-), Japanese mineralogist
Physical Properties:
Cleavage:
None
Color:
black.
Density:
3.93
Diaphaniety:
Opaque
Hardness:
6 - Orthoclase
Luster:
Metallic
Streak:
brown
More details...