General Information:
Chemical Formula:
Na(CaNa)Fe++4(Al,Fe+++)Si7AlO22(OH)2
Composition:
(Molecular Weight = 953.22 gm)
Sodium 4.82 % Na
Calcium 4.20 % Ca
Aluminum 4.95 % Al
Iron 24.90 % Fe
Silicon 20.62 % Si
Hydrogen 0.21 % H
Oxygen 40.28 % O
Empirical Formula:
Na2CaFe2+4Al0.75Fe3+0.25(Si7AlO22)(OH)2
IMA Status:
Approved IMA
Physical Properties:
Cleavage:
[???] Good
Color:
brownish lilac or dark red.
Diaphaniety:
Transparent
Hardness:
6-7 - Orthoclase-Quartz
Luster:
Vitreous (Glassy)
More details...