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The bauxite (red-brown solid) - aluminium oxide mixed with impurities-is extracted from the earth. The extracted aluminium oxide is then treated with alkali, to remove the impurities. This results in a white solid called aluminium oxide or alumina.
Gallium only occurs as a trace element in ores of other metals. It can be extracted from bauxite (aluminum ore), coal, zinc ore, and other minerals. Bauxite is the most common source. Gallium can be extracted from mineral ores by conventional industrial chemical means.