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The only ore of chromium, the metal used to make stainless steel, nichrome, and chrome plating. Chromite: Chromite from the Transvaal area of South Africa. Specimen is approximately 4 inches (10 centimeters) across.

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Aluminum - The ore is mined from rocks that have been exposed to weathering in a tropical environment, bauxite. The main ore minerals in bauxite are gibbsite, bohmeite, and diaspore. Antimony - The primary ore of antimony is it's sulfide, stibnite.

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