Igneous rock | |
![]() Monzonite specimen from Rock Library (NASA JPL) | |
Composition | |
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Mostly plagioclase and alkali feldspar |
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.
Syenodiorite is an obsolescent term for monzonite[1] or for monzodiorite.[2] Larvikite is a particular form of monzonite.[3]
andersen-1984
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