Product Description
Columbite-(Mn) AKA Manganese Dominant Columbite
Weight: 47 Grams
Size: 35x27x19mm
Locality: Petaca Mining District, Rio Arriba County, New Mexico, USA
XRF analysis performed by Charles David Young, who also numbered the bottom of the specimen.
Formula: : MnNb2O6
Columbite-(Mn) is a manganese-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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