Columbite-(Fe) Mineral Gallery

Columbite-(Fe): Fe++Nb2O6  
Microcline: KAlSi3O8

Comments: Blocky, dark brown ferrocolumbite on pale greenish blue amazonite (microcline).
Location: Crystal Park, El Paso Co., Colorado, USA. Scale: 2.5 x 1.5 cm.
© Fabre Minerals

Columbite-(Fe): Fe++Nb2O6  
Baotite: Ba4(Ti,Nb)8Si4O28Cl

Comments: Minute brown crystalline grains of baotite in dark ferrocolumbite (columbite-(Fe)).
Location: Sheep Creek, Ravalli County, Montana. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Columbite-(Fe): Fe++Nb2O6  
Plumbopyrochlore: (Pb,Y,U,Ca)2-xNb2O6(OH)

Comments: Brown plumbopyrochlore crystal with dark brown ferrocolumbite (columbite-(Fe)).
Location: Holdazan, Buregteg, Mongolia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Columbite-(Fe): Fe++Nb2O6

Comments: Dark, coaly black, weathered granular ferrocolumbite. This specimen was originally identified as samarskite-(Y) and corrected by Fred Davis who studied the locality.
Location: Spinelli Samarskite Prospect, Glastonbury, Hartford Co., Connecticut, USA. Scale: Picture size 4 mm.
© Paul M. Schumacher

Columbite-(Fe): Fe++Nb2O6

Comments: Dark grains of columbite-(Fe) wtth small brown grains of fluorcarbonates of LREE. Corrected identificaton by Pavel M. Kartashov who analyzed this occurrence of 'chagbaiite'.
Location: Round Top Rhyolite, Hudspeth County, Texas, USA. Scale: Picture Size 1 mm.
© Thomas Witzke

Columbite-(Fe): Fe++Nb2O6  
Upalite: Al(UO2)3(PO4)2O(OH)·7(H2O)

Comments: Thin translucent yellowish upalite crusts on a prismatic, black columbite crystal.
Location: Thin translucent yellowish crusts on undifferntiated columbite crystal. Scale: Picture Size 2 mm.
© Jeff Weissman / Photographic Guide to Mineral Species