Intermediate composition
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.
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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: | Picrite basalt |
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