General Information:
Chemical Formula:
Na(CaNa)(Mg,Fe++)5[Si8O22](OH)2
Composition:
(Molecular Weight = 881.35 gm)
Sodium 5.22 % Na
Calcium 4.55 % Ca
Magnesium 8.27 % Mg
Iron 12.67 % Fe
Silicon 25.49 % Si
Hydrogen 0.23 % H
Oxygen 43.57 % O
Empirical Formula:
Na2CaMg3Fe2+2(Si8O22)(OH)2
IMA Status:
Approved IMA 1978
Physical Properties:
Cleavage:
[110] Perfect, [100] Perfect
Color:
blue, brown, brown red, gray violet, or yellow.
Density:
3.09
Diaphaniety:
Transparent to translucent
Habits:
Tabular - Form dimensions are thin in one direction., ,
Hardness:
6 - Orthoclase
Luster:
Vitreous (Glassy)
Streak:
white
More details...