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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...
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chemically similar to
columbite, and the two are
often grouped together as a semi-singular
mineral called coltan or "
columbite-tantalite" in many mineral...
- 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...
- the
chemically similar niobium,
mainly in the
mineral groups tantalite,
columbite and coltan. The
chemical inertness and very high
melting point of tantalum...
- 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...
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Coesite Coffinite Cohenite Colemanite Colimaite Collinsite Coloradoite Columbite (mineral group)
Combeite Conichalcite Connellite Cooperite Copiapite Copper...
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Coltan is the
colloquial name for the
mineral columbite-tantalum ("col-tan"). In the
early 21st
century coltan mining is ****ociated with
human rights...
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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...
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alternative to nickel.
Niobium is
often found in the
minerals pyrochlore and
columbite. Its name
comes from Gr**** mythology: Niobe,
daughter of Tantalus, the...
