Columbite-(Fe)

columbite-(Fe)

columbite-(Mn)

niobium

tantalite-(Fe)

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Formula: Fe2+Nb2O6
Multiple oxide containing niobium, columbite group, forms series with tantalite-(Fe) and with columbite-(Mn)
Specific gravity: 5.2 to 6.65
Hardness: 6
Streak: Black to dark brown
Colour: Black to brownish black, commonly tarnishes to iridescent
Environments

Pegmatites
Carbonatites rarely
Placer deposits

Columbite-(Fe) occurs as an accessory mineral in granitic pegmatites, rarely in carbonatites and in placer deposits (Mindat).

Localities

The type locality is the Green's Well pegmatite, Pilgangoora, East Pilbara Shire, Western Australia.

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