File:Bianco_Sardo_Granit_mit_polierter_Oberfläche.jpg · Wikimedia Commons · See Wikimedia Commons

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Granite (, ) is a coarse-grained (phaneritic) intrusive igneous rock composed mostly of quartz, alkali feldspar, mica and plagioclase. It forms from magma with a high content of silica and alkali metal oxides that slowly cools and solidifies underground. It is common in the continental crust of Earth, where it is found in igneous intrusions. These range in size from dikes only a few centimeters across to batholiths exposed over hundreds of square kilometers.

AI overview

Granite is a hard rock made mostly of quartz, feldspar, and mica that forms when hot, mineral-rich magma cools slowly underground. It is very common in Earth's continental crust and appears in a wide range of sizes, from small formations just a few centimeters wide to massive formations covering hundreds of square kilometers.

AI-generated from the Wikipedia summary — may contain errors.

Key facts

Rock.name: Granite
Rock.type: Igneous
Rock.image: Bianco Sardo Granit mit polierter Oberfläche.jpg
Rock.image_size: 300px
Rock.caption: Granite containing plagioclase feldspar, potassium feldspar, quartz, biotite, and/or amphibole
Rock.composition: potassium feldspar, plagioclase feldspar, and quartz
Rock.composition_secondary: Differing amounts of muscovite, biotite, and hornblende-type amphiboles
Rock.class: Felsic