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What substances can be obtained when limestone is heated?
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How was marble formed?
Marble is a metamorphic(characterized by change of form) limestone. When the limestone is heated and pressure is put on it, the calcite(CaCO3) in it melts. If the limestone was pure before heat or pressure was applied to it, a white marble will be obtained. If it had hematite or haematite(iron oxide, Fe2O3) or clay in it, reddish marble will be obtained.