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.
Locality:
Langban, Varmland, Sweden.
Name Origin:
Named from the Greek for "small tablet", in allusion to the morphology.
Physical Properties:
Cleavage:
[010] Good
Color:
black.
Density:
3.88
Habits:
Tabular - Form dimensions are thin in one direction., ,
Hardness:
6 - Orthoclase
Luster:
Adamantine - Metallic
Streak:
brown gray
More details...