Tantalite, (Fe,Mn)(Ta,Nb)2O6, São Pedro claim, Malacacheta, Malacacheta district, Jequitinhonha valley, Minas Gerais, Brazil. Dimensions: 36 x 22x 22 mm. Franco Amadori photo. Paolo Franchi collection.
Columbite-(Fe), Fe++Nb2O6, pegmatite area near Conselheiro Pena, Minas Gerais, Brazil. A well-developed crystal of Columbite-(Fe) displaying a tabular-blocky habit with crystals in parallel position associated with creamy white bladed crystals of probable Albite.
Columbite-(Fe), Fe2+Nb2O6, Galilea, Minas Gerais, Brazil. Superb single crystal of black columbite-(Fe) with striated prism faces and complex termination. The crystal is complete on all faces with few imperfections. Overall Size: 4x3.5x3 cm, Crystals: 4 cm