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Bauxite
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Bauxite, by Wikipedia https://en.wikipedia.org/wiki?curid=3760 / CC BY SA 3.0 • #Sedimentary_rocks • #Aluminium_minerals • #Bauxite_mining • #Regolith • #Weathering • Bauxite with US penny for comparison QEMSCAN mineral maps of bauxite ore-forming pisoliths Bauxite is a sedimentary rock with a relatively high aluminium content. • It is the world's main source of aluminium and gallium. • Bauxite consists mostly of the aluminium minerals gibbsite （Al（OH）3）, boehmite （γ-AlO（OH）） and diaspore （α-AlO（OH））, mixed with the two iron oxides goethite （FeO（OH）） and haematite （Fe2O3）, • the aluminium clay mineral kaolinite （Al2Si2O5（OH）4） and small amounts of anatase （TiO2） and ilmenite （FeTiO3 or FeO.TiO2）. • Bauxite appears dull in luster and is reddish-brown, white, or tan in color. • In 1821 the French geologist Pierre Berthier discovered bauxite near the village of Les Baux in Provence, southern France. • Bauxite with core of unweathered rock Numerous classification schemes have been proposed for bauxite but, as of 1982, there was no consensus. • Vadász （1951） distinguished lateritic bauxites （silicate bauxites） from karst bauxite ores （carbonate bauxites）: In the case of Jamaica, recent analysis of the soils showed elevated levels of cadmium, • suggesting that the bauxite originates from recent Miocene ash deposits from episodes of significant volcanism in Central America. • World bauxite production in 2005 One of the world's largest bauxite mines in Weipa, Australia Australia is the largest producer of bauxite, followed by China. • Increased aluminium recycling, which has the advantage of lowering the cost in electric power in producing aluminium, will considerably extend the world's bauxite reserves. • In November 2010, Nguyen Tan Dung, the prime minister of Vietnam, announced that Vietnam's bauxite reserves might total 11,000 Mt （11 trillion kg）; this would be the largest in the world. • Bauxite being loaded at Cabo Rojo, Dominican Republic, to be shipped elsewhere for processing; 2007 Play media Bauxit...
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