JEAN-CLAUDE REVY, ISM / SCIENCE PHOTO LIBRARY JEAN-CLAUDE REVY, ISM / SCIENCE PHOTO LIBRARY
Grey granite rock surface. Granite is an igneous rock, one that formed from the cooling of molten rock. Crystals are seen in the surface of the rock. 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. Cut and polished granite is used as ornamental stonework in buildings, such as for kitchen surface. The area of granite seen here is 0.7 centimetres across.
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