Columbite

Columbite, also called niobite, niobite-tantalite and columbateFormula:Fe²⁺Nb₂O₆, ((Fe, Mn)(Nb, Ta)₂O₆) ^{Mineralklasse:}^{Oxide, Hydroxide}Mohs scale hardness: 6Specific gravity: 5.2-8.1 g/cm³^Ta₂^O₅max^content:²⁵^%^Nb₂^O₅^content:^{50-80 %}

^Sc₂^O₃max^content:²^%

^TiO₂^max^content:^4.6^%

^{Other constituents:}^{Sc, Ti, Re}

^Application:^{Raw material for production of Niobium}

References

https://en.wikipedia.org
https://www.dakotamatrix.com/mineralpedia/6276/columbite-fe
https://ru.wikipedia.org/wiki/%D0%9A%D0%BE%D0%BB%D1%83%D0%BC%D0%B1%D0%B8%D1%82
https://en.wikipedia.org/wiki/Columbite
https://www.mindat.org/min-3882.html
https://www.mindat.org/show.php?id=3882&ld=1#themap
http://creationwiki.org/Columbite
http://wiki.web.ru/wiki/%D0%9A%D0%BE%D0%BB%D1%83%D0%BC%D0%B1%D0%B8%D1%82-%D1%82%D0%B0%D0%BD%D1%82%D0%B0%D0%BB%D0%B8%D1%82

Localities for Columbite-Fe include in the United States including here in the Black Hills of South Dakota at the Beecher lode and in the Bob Ingersoll, Etta, and White Cap mines, Norway, Russia, Italy, Madagascar, Australia, and Japan among a few others. In fact, the two are often grouped together as a semi-singular mineral series called columbite-tantalite or coltan in many mineral guides. However, tantalite has a much greater specific gravity than columbite, more than 8.0 compared to columbite's 5.2. It has an sub metallic luster and a high density. During the processing of columbite, plants use the following types of separation:

June 2, 2017

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