What is a bauxite?
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Bauxite (not mineral, rock = mix of Al-hydroxides) yellow to red-brown (from Fe impurities), earthy luster, common pisolitic texture (round ¬ oval grains); occurs in soils called laterites which form in tropical climates due to intense chemical weathering (heavy rainfall leaches easily dissolved elements from soil, leaving insoluble Al-hydroxides (and Fe-hydroxides)); major source of Al ore
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