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Niobium
Niobium
, formerly
columbium
, is a
chemical element
with symbol
Nb
(formerly
Cb
) and
atomic number
41. It is a soft, grey,
ductile
transition metal
, which is often found in the
pyrochlore
mineral, the main commercial source for niobium, and
columbite
. The name comes from
Greek mythology
:
Niobe
, daughter of
Tantalus
since it is so similar to tantalum.
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