Granite

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.

hornblende-biotite granite containing large round crystals of orthoclase each with a rim of oligoclase

Unakite is a coarse-grained metamorphic rock that is an altered granitoid composed of orthoclase feldspar (pink), epidote (yellow-green), and quartz (smokey or colorless). Albite-oligoclase plagioclase (white) may or may not be also present.

granitoid in which at least 90% of the total feldspar is alkali feldspar

thumb|QAPF diagram with the Monzogranite field highlighted Monzogranite is a plutonic rock that occupies the middle of the QAPF diagram, consisting of between 20–60% quartz, and of the remainder, between 35–65% alkali feldspar and the remainder plagioclase.

smaller chunks or particles of granite, produced by weathering

Geological formation in Agder, Norway