Granitic rocks

thumb|Diorite thumb|Orbicular diorite from Corsica (corsite) thumb|upright=1.7|QAPF diagram with dioritoid fields highlighted in yellow and diorite in red thumb|upright=1.4|Mineral assemblage of igneous rocks

thumb|upright=1.4|A sample of granodiorite from the Massif Central, France thumb|upright=1.4|QAPF diagram for classification of plutonic rocks. The composition field for granodiorite is indicated in blue. upright=1.4|thumb|Mineral assemblage of igneous rocks thumb|Photomicrograph of [[thin section of granodiorite from Slovakia (in crossed polarised light)]]

thumb|Syenite from Corsica thumb|upright=1.5|QAPF diagram that shows the [[quartz (Q), alkali feldspar (A), and plagioclase (P) composition of syenite]] thumb|Leucocratic variety of [[nepheline syenite from Sweden (särnaite)]] Syenite is a coarse-grained intrusive igneous rock with a general composition similar to that of granite, but deficient in quartz, which, if present at all, occurs in relatively small concentrations (< 5%). It is considered a granitoid. Some syenites contain larger proportions of mafic components and smaller amounts of felsic material than most granites; those are classe

Monzonite is an igneous intrusive rock, formed by slow cooling of underground magma that has a moderate silica content and is enriched in alkali metal oxides. Monzonite is composed mostly of plagioclase and alkali feldspar.

thumb|A piece of tonalite on red granite gneiss from Tjörn, Sweden thumb|QAPF diagram with tonalite field highlighted Tonalite is an igneous, plutonic (intrusive) rock, of felsic composition, with phaneritic (coarse-grained) texture. Feldspar is present as plagioclase (typically oligoclase or andesine) with alkali feldspar making up less than 10% of the total feldspar content. Quartz (SiO2) is present as more than 20% of the total quartz-alkali feldspar-plagioclase-feldspathoid (QAPF) content of the rock. Amphiboles and biotite are common in lesser quantities, while accessory minerals include

thumb|Granite rock hand-sized sample

Trondhjemites are leucotonalites, a variety of leucocratic tonalite in which the modal mineralogy mostly consists of plagioclase in the form of albite to andesine, >20% quartz, and <10% alkali feldspar. Trondhjemites that occur in the oceanic crust or in ophiolites are usually called plagiogranites.

type of igneous rock

igneous, plutonic rock

thumb|Leucogranite from Lozère, France thumb|Leucogranite of the Boscobel complex, Virginia Leucogranite is a light-colored, granitic, igneous rock containing almost no dark minerals.

thumb|right|Luxullianite from Cornwall, showing dark patches of tourmaline and pink crystals of orthoclase thumb|right|Thin section of luxullianite from Cornwall, showing clusters of radially-arranged, acicular, greenish tourmaline crystals Luxullianite (also known as luxulyanite or luxulianite) is a rare type of porphyritic tournalinized granite, notable for the presence of clusters of radially-arranged acicular tourmaline crystals enclosed by phenocrysts of orthoclase and quartz in a matrix of quartz, tourmaline, alkali feldspar, brown mica, and cassiterite.