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https://ha.wikipedia.org/wiki/Columbite
Columbite - Wikipedia
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https://infogram.com/copy-columbite-tantalite-1g8djp9ord6vpyw
Copy: Columbite-tantalite by hyegyocha - Infogram
Coltan is short for Columbite-tantalite a black tar like mineral found in major quantities in the Congo.
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