General Information:
Chemical Formula:Ca(Ta,Nb)4O11
Composition:(Molecular Weight = 670.87 gm)Calcium 5.97 %
CaTantalum 53.94 %
TaNiobium 13.85 %
NbOxygen 26.23 %
O Empirical Formula: CaTa2NbO11
Environment:Granite pegmatites.
IMA Status:Approved IMA 1982
Locality:Kola Peninsula, Russia.
Name Origin:Named for its composition (Calcium, Tantalum).
Physical Properties: Cleavage:None
Color:colorless.
Density:7.46
Diaphaniety:Transparent
Habits:Square - Occurs as square crystals in shape or outline., Hexagonal - Six-sided crystal shape in cross-section or habit., Inclusions - Generally found as inclusions in other minerals.
Hardness:6.5 - Pyrite
Luminescence:Non-fluorescent.
Luster:Adamantine
Streak:white
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