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corundum mine process 1

This process involves taking the necessary oxide components for gem corundum e.g., Al 2 O 3, Fe 2 O 3, TiO 2, Cr 2 O 3 in powdered form and melting them together in a hot container that is just barely over the crystallizing temperature. A rod with a small corundum seed crystal is lowered into the molten material and then very slowly removed.