Granite is the most abundant igneous rock in the continental parts of the Earth’s crust. There are many different types of granite, but all have been formed by the melting of other rocks. The composition of granite tells us whether sedimentary or other igneous rocks were melted.

Granite is composed mainly of quartz and minerals from the feldspar, mica and amphibole groups. Crystals form slowly because large bodies of granite magma may take over a million years to cool completely. Uplift and erosion may eventually expose the granite at the Earth’s surface.


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