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What are high alumnia minerals ?

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What are high alumnia minerals ?

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  1. Minerals with a high aluminium content relative to silica and other metals.  Amongst the rock-forming minerals the feldspars, especially anorthite: Some clay minerals have a high alumina content. and bauxite - aluminium ore - consists of oxides and hydroxides of aluminium (Goethite, Boehmite).  Metamorphic aluminous minerals include kyanite and its polymorphs sillimanite and andalusite, corundum, epidote, and others.  

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