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Columbia River
Columbia tiger lily
Columbia University
Columbiad
Columbian
columbian mammoth
Columbic
Columbic acid
Columbidae
Columbier
Columbiferous
columbiform bird
Columbiformes
Columbin
Columbine
Columbite
-- columbite-tantalite --
Columbium
Columbo
Columbus
Columbus Day
Columella
Columelliform
Column
Column Address Strobe
column chromatography
column inch
Column rule
Columnar
columnar cell
columnar epithelial cell
Columnar epithelium
Columnar structure
columbite-tantalite
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Noun
1.
columbite-tantalite
-
a
valuable
black
mineral
combining
niobite
and
tantalite
;
used
in
cell
phones
and
computer
chips
Synonyms:
coltan
coltan
,
mineral
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