One of the most common intrusive rocks, granite has a total silica content above 65 percent and a minimum quartz content of 20 percent. K-feldspars (orthoclase and microcline) are normally dominant over plagioclase (Na-rich) feldspar and often pink. Mica occurs as dark biotite or as silvery muscovite. Hornblende may be present.
TEXTURE Granite is a coarse-grained rock with crystals larger than 3⁄16 in (5 mm) in diameter.
ORIGIN Forms at considerable depth in the Earth’s crust.
Origin: Intrusive
Grain size: Coarse
Crystal shape: Anhedral, Euhedral
Classification: Felsic
Occurrence: Pluton
Color: Light
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