General Information:
Chemical Formula:
NaCa2(Mg4Ti)Si6Al2O23(OH)2
Composition:
(Molecular Weight = 872.72 gm)
Sodium 2.63 % Na
Calcium 9.18 % Ca
Magnesium 11.14 % Mg
Titanium 5.49 % Ti
Aluminum 6.18 % Al
Silicon 19.31 % Si
Hydrogen 0.23 % H
Oxygen 45.83 % O
Empirical Formula:
NaCa2Mg4Ti(Si6Al2O23)(OH)2
IMA Status:
Approved IMA 1978
Physical Properties:
Cleavage:
[110] Perfect
Color:
dark brown or black.
Density:
3.2 - 3.28, Average = 3.24
Diaphaniety:
Translucent to Subopaque
Hardness:
5-6 - Between Apatite and Orthoclase
Luster:
Vitreous - Resinous
Streak:
brownish gray
More details...