Niobite
Niobite, also called
columbate and
columbite (
Fe,
Mn)(
Nb,
Ta)
2)
O6]) is a black
mineral that is an ore of
niobium and
tantalum. It has a submetallic
luster and a high
specific gravity and is a niobate of
iron and
manganese, containing tantalate of iron. This mineral was first found in
New England.
See also: List of minerals