Marble is formed from limestone by heat and pressure in the earth’s crust. These forces cause the limestone to change in texture and makeup. This process is called recrystallisation. Fossilised materials in the limestone, along with its original carbonate minerals, recrystallise and form large, coarse grains of calcite. Impurities present in the limestone during recrystallisation affect the mineral composition of the marble that forms. The minerals that result from impurities give marble a wide variety of colours. The purest calcite marble is white. Marble containing hematite has a reddish colour. A marble that has limonite is yellow, and marble with serpentine is green.
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