General Information:
Chemical Formula:
(Ca,Th,Mn)3Si4O11F·6(H2O)
Composition:
(Molecular Weight = 712.88 gm)
Calcium 10.12 % Ca
Thorium 29.29 % Th
Manganese 2.31 % Mn
Silicon 15.76 % Si
Hydrogen 1.70 % H
Oxygen 38.15 % O
Fluorine 2.67 % F
Empirical Formula:
Ca1.8Th0.9Mn2+0.3Si4O11F6(H2O)
IMA Status:
Approved IMA 1962
Physical Properties:
Color:
dark brown, black, or black brown.
Density:
3.02
Diaphaniety:
Translucent to Opaque
Hardness:
4 - Fluorite
Luster:
Vitreous - Greasy
Streak:
dark brown
More details...