General Information:
Chemical Formula:
Na2Nb4O11·9(H2O)
Composition:
(Molecular Weight = 755.74 gm)
Sodium 6.08 % Na
Niobium 49.17 % Nb
Hydrogen 2.40 % H
Oxygen 42.34 % O
Empirical Formula:
Na2Nb4O11·9(H2O)
Environment:
In a dawsonite-bearing sill in vugs.
IMA Status:
Approved IMA 1981
Locality:
Francon Quarry, Montreal Island, Quebec, Canada.
Name Origin:
Named for the locality.
Physical Properties:
Cleavage:
[001] Parting
Color:
white.
Density:
2.72
Diaphaniety:
Transparent to Translucent
Habits:
Aggregates - Made of numerous individual crystals or clusters., Bladed - Aggregates of thin lath-like crystals (e.g. kyanite).,
Hardness:
4 - Fluorite
Luminescence:
Non-fluorescent.
Luster:
Vitreous - Silky
Streak:
white
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