Calciotantite

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:whiteMore details...