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