General Information:
Chemical Formula:
(Fe++,Mg,Mn)3B7O13Cl
Composition:
(Molecular Weight = 458.00 gm)
Magnesium 4.78 % Mg
Manganese 3.60 % Mn
Iron 21.95 % Fe
Boron 16.52 % B
Chlorine 7.74 % Cl
Oxygen 45.41 % O
Empirical Formula:
Fe2+1.8Mg0.9Mn2+0.3B7O13Cl
Physical Properties:
Cleavage:
None
Color:
brown, light green, red, or black.
Density:
3.22
Diaphaniety:
Transparent
Hardness:
7-7.5
Luster:
Vitreous (Glassy)
Streak:
white
More details...