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Intermediate composition

Intermediate composition

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In igneous petrology, an intermediate composition refers to the chemical composition of a rock that has 51.5–63 wt% SiO₂ being an intermediate between felsic and mafic compositions. Typical intermediate rocks include andesite and trachyandesite among volcanic rocks and diorite and granodiorite among plutonic rocks.

Common igneous rocks classified by silicon dioxide content

Type	Ultramafic <45% SiO₂	Mafic 45–52% SiO₂	Intermediate 52–63% SiO₂	Intermediate–felsic 63–69% SiO₂	Felsic >69% SiO₂
Volcanic rocks: Subvolcanic rocks: Plutonic rocks:	Picrite basalt Peridotite	Basalt Diabase (Dolerite) Gabbro	Andesite Microdiorite Diorite	Dacite Microgranodiorite Granodiorite	Rhyolite Microgranite Granite

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