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Geology glossary

granite

Volcanology
Pink granite (image: Friman / Wikimedia Commons)
Pink granite (image: Friman / Wikimedia Commons)
Granite is the most well-known and one of the most common intrusive magmatic (plutonic) rock type. It is formed when an intrusion of viscous magma with high silica content (68-75 wt %) remains under the surface of the earth, where it cools and crystallizes slowly inside the crust.
Granite is the equivalent of its extrusive (volcanic) rock type rhyolite. It is granular and coarse-grained in texture. Its principal minerals are feldspars, quartz, and mica.

Granites can be predominantly white, pink, or gray in color, depending on their mineralogy.

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diorite

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