co·lum·bite 
(kə-lŭmbīt′)
(kə-lŭmbīt′)n.
A black, red-brown, or colorless mineral, essentially (Fe, Mn)(Nb, Ta)2O6, the principal ore of niobium.
[COLUMB(IUM) + -ITE1.]
- postwar
- postwoman
- posy
- pot
- pot
- potability
- potable
- potableness
- potage
- potamology
- Potaro
- potash
- potash feldspar
- potassic
- potassium
- potassium-argon
- potassium bicarbonate
- potassium bitartrate
- potassium bromide
- potassium carbonate
- potassium chlorate
- potassium chloride
- potassium cyanide
- potassium dichromate
- potassium feldspar