![]() ![]() The rock formations generally found in Goa include quartzite and quartz-sericite schist, quartz-chlorite schist, metavolcanics, conglomerates, limestone, phylites, banded ferruginous quatzite, granitic gneisses and various basic and ultrabasic intrusives, etc. The bauxite genesis occurs from silica, Alumina, and iron rich rocks when silica is removed leading to enrichment of Al 2O 3 and Fe 2O 3 whereby silica values coming down from 40% to about 2-3%.The Goa bauxite falls in the group of inter tropical bauxite deposits and are associated with laterites derived from metamorphic rocks.It is formed in tropical and subtropical latitudes under good drainage conditions. The impurities are silica, clay, silt, iron hydroxide and titania. It consists chiefly of hydrated aluminium oxides like gibbsite, bohemite, and diaspore. ![]() The term bauxite is applied to the ores containing not less than 45-50% Al 2O 3 and not more than 20% Fe 2O 3 and 3-5% combined silica. ![]()
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