Monzonite

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.

Monzonite
Igneous rock
Monzonite specimen from Rock Library (NASA JPL)
Composition
Mostly plagioclase and alkali feldspar
Not to be confused with the rare earth-bearing phosphate mineral Monazite.

Syenodiorite is an obsolescent term for monzonite or for monzodiorite. Larvikite is a particular form of monzonite.

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