Columbite-(Fe) –Petaca Mining District, New Mexico, USA
Weight: 35.6 Grams
Size: 34x29x18mm
Locality:North Star Deposit, Petaca Mining District, Rio Arriba County, New Mexico, USA
Formula: FeNb₂O₆
65-75% Niobium by mass
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.
Found using The yDog by its maker, Charles David Young, who also performed the XRF analysis.
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