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Mineral chemistry of columbite–tantalite, tapiolite, wodginite and ixiolite in African Ta provinces. The chemical composition of the examined CGM, ...

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Zircon is an almost ubiquitous and relatively stable accessory mineral in the majority of ... 4718: Kymi: Evolved: ... P. BačíkAccessory columbite to tantalite, ...

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Ore concentrates are +derived principally from the minerals columbite, tantalite, pyrochlore, and ferroniobium, these minerals having a relatively high concentration of the desired metals. Columbium and tantalum ores are not currently mined in the United States, rather concentrates are imported from Canada, Brazil, and Australia.

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