Pink granite rock surface. Granite is an igneous rock, one that formed from the cooling of molten rock. Crystals formed in the rock as it cooled. Granite is mostly silica (silicon dioxide) and aluminium oxide, with traces of other chemicals. The exact colour and appearance depends on these traces and the conditions under which the rock formed. The pink colour seen here is due to the presence of iron oxides. Some specimens of coloured granite crystals are collected and used as ornamental stones. The area seen here is 3.5 centimetres across.
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