Columbite-(Mn) - Petaca Mining District, New Mexico, USA - Niobium Ore
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
Naturally radioactive due to uranium and or thorium contamination during formation
u/HurstonJr — 17 days ago