General Information:
Chemical Formula:
(K,Na)2(Nb,Ti)2Si4O12(O,OH)2·4(H2O)
Composition:
(Molecular Weight = 642.34 gm)
Potassium 9.13 % K
Sodium 1.79 % Na
Titanium 3.73 % Ti
Niobium 21.70 % Nb
Silicon 17.49 % Si
Hydrogen 1.33 % H
Oxygen 44.83 % O
Empirical Formula:
K1.5Na0.5Nb1.5Ti0.5Si4O13.5(OH)0.5·4(H2O)
Environment:
The mineral formed by the hydrothermal alteration of pyrochlore.
IMA Status:
Approved IMA 1995
Locality:
Lake Vuoriyarvi and the Vuoriyarvi alkali-ultramafic complex, Kola Peninsula, Russia.
Name Origin:
The name reflects the discovery locality.
Physical Properties:
Color:
white.
Density:
2.95
Diaphaniety:
Translucent
Habits:
Tabular - Form dimensions are thin in one direction., ,
Hardness:
4.5 - Between Fluorite and Apatite
Luminescence:
Non-fluorescent.
Luster:
Vitreous (Glassy)
Streak:
white
More details...