General Information:
Chemical Formula:
NaCa2(Fe++4Ti)Si6Al2O22(OH)2
Composition:
(Molecular Weight = 998.89 gm)
Sodium 2.30 % Na
Calcium 8.02 % Ca
Titanium 4.79 % Ti
Aluminum 5.40 % Al
Iron 22.36 % Fe
Silicon 16.87 % Si
Hydrogen 0.20 % H
Oxygen 40.04 % O
Empirical Formula:
NaCa2Fe3+4Ti(Si6Al2O23)(OH)2
IMA Status:
Approved IMA 1978
Physical Properties:
Cleavage:
[???] Good
Color:
black.
Density:
3.2
Hardness:
5-6 - Between Apatite and Orthoclase
More details...