General Information:
Chemical Formula:
NaNa2(Mg4Fe++)Si8O22(OH)2
Composition:
(Molecular Weight = 832.72 gm)
Sodium 8.28 % Na
Magnesium 11.67 % Mg
Iron 6.71 % Fe
Silicon 26.98 % Si
Hydrogen 0.24 % H
Oxygen 46.11 % O
Empirical Formula:
Na3Mg4Fe3+(Si8O22)(OH)2
IMA Status:
Approved IMA 1978
Physical Properties:
Color:
black or gray.
Density:
3.17
Diaphaniety:
Subopaque
Hardness:
5-6 - Between Apatite and Orthoclase
Luster:
Vitreous (Glassy)
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