Aluminum is in almost every rock, plant, and animal. It is the 3rd most plentiful element in the Earth’s surface, after oxygen and silicon, and its compounds make up about 15% of the weight of Earth’s crust. Aluminum is not found in pure form, but mixed with other elements. Areas with large amounts of aluminum compounds are mined for aluminum ore or ‘bauxite’. Australia is the world’s largest source of bauxite. Bauxite is the separated from the other elements using electrial currents. This produces pure aluminum for foil and other materials.