
Silver gold etc. These are usually formed in the company of rock or alluvial impurities like clay, sand etc. Oxidised Ores:These ores consist of oxides or oxysalts (eg. carbonates, phosphate) and silicate of metal. Important oxide ore includes, Fe 2 O 3, Al 2 O 3.2H 2 O etc. and important cabonate ores are limestone (CaCO 3), Calamine (ZnCO 3) etc
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