General Information:
Chemical Formula:
Na(CaNa)Fe++3AlFe+++[Si6Al2O22](OH)2
Composition:
(Molecular Weight = 944.90 gm)
Sodium 4.87 % Na
Calcium 4.24 % Ca
Aluminum 8.57 % Al
Iron 23.64 % Fe
Silicon 17.83 % Si
Hydrogen 0.21 % H
Oxygen 40.64 % O
Empirical Formula:
Na2CaFe2+3AlFe3+(Si6Al2O22)(OH)2
Environment:
Nepheline-bearing igneous rocks.
IMA Status:
Approved IMA 1978
Locality:
Wali-tarama, Mariupol, Ukraine.
Name Origin:
Named after the locality.
Physical Properties:
Cleavage:
[110] Perfect
Color:
blue green or black.
Density:
3.5
Diaphaniety:
Transparent to Translucent
Hardness:
5-6 - Between Apatite and Orthoclase
Luster:
Vitreous (Glassy)
Streak:
greenish gray
More details...