Product Description
Columbite-(Fe) AKA Ferrocolumbite
Weight: 75.6 grams
Size: 43x30x26mm
Locality: Petaca Mining District, Rio Arriba County, New Mexico, USA
XRF analysis was performed by Charles David Young, who also numbered the bottom of the specimen.
Formula: FeNb₂O₆
Columbite-(Fe) is an iron-dominant niobium oxide mineral of the columbite–tantalite group, typically forming black to dark brown prismatic crystals with a submetallic luster. It occurs mainly in granitic pegmatites and is an important ore of niobium.
65-75% Niobium by mass
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