JEAN-CLAUDE REVY, ISM / SCIENCE PHOTO LIBRARY JEAN-CLAUDE REVY, ISM / SCIENCE PHOTO LIBRARY
Granite with amphibole. Granite is an igneous rock, one that formed from the cooling of molten rock. Granite is mostly silica (silicon dioxide, white) 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. Here, the dark areas are inclusions of the mineral amphibole. The area seen here is 2.3 centimetres across.
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