General Information:
Chemical Formula:
Ca4Mn+++3-x(BO3)3(CO3)(O,OH)3
Composition:
(Molecular Weight = 582.85 gm)
Calcium 27.51 % Ca
Manganese 23.56 % Mn
Boron 5.56 % B
Hydrogen 0.13 % H
Carbon 2.06 % C
Oxygen 41.18 % O
Empirical Formula:
Ca4Mn3+2.5(BO3)3(CO3)O2.25(OH)0.75
IMA Status:
Approved IMA 1964
Physical Properties:
Cleavage:
None
Color:
black.
Density:
3.35 - 3.5, Average = 3.42
Diaphaniety:
Subopaque
Hardness:
6 - Orthoclase
Luster:
Adamantine - Resinous
Streak:
brown
More details...