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Columbite, also
called niobite, niobite-tantalite and columbate, with a
general chemical formula of (FeII,MnII)Nb2O6, is a
black mineral group that is...
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Coltan (short for
columbite–tantalites and
known industrially as tantalite) is a dull
black metallic ore from
which the
elements niobium and tantalum...
-
chemically similar to
columbite, and the two are
often grouped together as a semi-singular
mineral called coltan or "
columbite-tantalite" in many mineral...
- the
chemically similar niobium,
mainly in the
mineral groups tantalite,
columbite, and coltan. The
chemical inertness and very high
melting point of tantalum...
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Coesite Coffinite Cohenite Colemanite Colimaite Collinsite Coloradoite Columbite (mineral group)
Combeite Conichalcite Connellite Cooperite Copiapite Copper...
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Protectorates was founded. By the 1940s,
Nigeria was a
major producer of tin,
columbite, and coal. The
discovery of oil in 1956 hurt the
mineral extraction industries...
- MnII)Ta2O6, a tantalum(V)
mineral group close to that of
columbite Coltan, a
mixture of
columbite and
tantalite series Galaxite, MnIIAl2O4, a
spinel mineral...
- 001 ft)
above sea
level in the
Shere Hills range near Jos.
Years of tin and
columbite mining have left the area
strewn with deep
gorges and lakes.
Bauchi State –...
- specimens. In 1801,
Hatchett analyzed a
piece of
columbite from the
collection at the
British Museum.
Columbite turned out to be a very
complex mineral, and...
-
alternative to nickel.
Niobium is
often found in the
minerals pyrochlore and
columbite. Its name
comes from Gr**** mythology: Niobe,
daughter of Tantalus, the...
