General Information:
Chemical Formula:
Na(CaNa)Fe++5[Si8O22](OH)2
Composition:
(Molecular Weight = 975.98 gm)
Sodium 4.71 % Na
Calcium 4.11 % Ca
Iron 28.61 % Fe
Silicon 23.02 % Si
Hydrogen 0.21 % H
Oxygen 39.34 % O
Empirical Formula:
Na2CaFe2+5(Si8O22)(OH)2
IMA Status:
Approved IMA 1978
Physical Properties:
Cleavage:
[110] Perfect
Color:
brown, light green, dark green, or reddish brown.
Density:
3.46
Diaphaniety:
Transparent to Translucent
Hardness:
5-6 - Between Apatite and Orthoclase
Luster:
Vitreous (Glassy)
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