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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
TypeUltramafic
<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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