General Information:
Chemical Formula:
Na11Nb2TiSi4O12(PO4)2O5F2
Composition:
(Molecular Weight = 1,098.85 gm)
Sodium 23.01 % Na
Titanium 4.36 % Ti
Niobium 16.91 % Nb
Silicon 10.22 % Si
Phosphorus 5.64 % P
Oxygen 36.40 % O
Fluorine 3.46 % F
Empirical Formula:
Na11Nb2TiSi4O17(PO4)2F2
Environment:
Albitized alkalic rocks.
IMA Status:
Approved IMA 1973
Locality:
Vuonnemi River, Khibiny massif, Kola Peninsula, Russia. Il¡maussaq, Greenland.
Name Origin:
Named after its locality.
Physical Properties:
Cleavage:
[001] Perfect, [???] Very Good, [???] Very Good
Color:
light yellow, lemon yellow, or greenish yellow.
Density:
3.13
Habits:
Platy - Sheet forms (e.g. micas)., Bladed - Aggregates of thin lath-like crystals (e.g. kyanite).,
Hardness:
2-3 - Gypsum-Calcite
Luminescence:
Fluorescent, Short UV=greenish yellow, Long UV=pale greenish yellow.
Luster:
Vitreous - Greasy
Streak:
white
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