General Information:
Chemical Formula:
Na6(Ca,Mn)(Ti,Fe)Si6O18·(H2O)
Composition:
(Molecular Weight = 711.83 gm)
Sodium 19.38 % Na
Calcium 2.82 % Ca
Titanium 3.36 % Ti
Manganese 3.86 % Mn
Iron 3.92 % Fe
Silicon 23.67 % Si
Hydrogen 0.28 % H
Oxygen 42.71 % O
Empirical Formula:
Na6Ca0.5Mn2+0.5Ti0.5Fe3+0.5Si6O18·(H2O)
Environment:
In alkalic pegmatites.
IMA Status:
Approved IMA 1974
Locality:
Mt. Koashva, Khibiny massif, Kola, Peninsula, Russia.
Name Origin:
Named for the locality.
Physical Properties:
Cleavage:
None
Color:
brownish yellow or light yellow.
Density:
2.98 - 3.02, Average = 3
Diaphaniety:
Transparent
Hardness:
6 - Orthoclase
Luster:
Vitreous (Glassy)
Streak:
white
More details...