General Information:
Chemical Formula:
Ca(Ta,Nb)4O11
Composition:
(Molecular Weight = 670.87 gm)
Calcium 5.97 % Ca
Tantalum 53.94 % Ta
Niobium 13.85 % Nb
Oxygen 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
More details...