What is monzodiorite in geology ?

Monzodiorite : definition

Streckeisen diagrams (or QAPF diagrams) - Classification of plutonic and volcanic rocks

A monzodiorite is a plutonic rock intermediate between monzonite and diorite, equivalent to trachyandesite, also called syenodiorite. It is a grainy rock, usually dark in color, with plagioclases (oligoclase and andesine, representing 60% to 90% of the total feldspars), orthocalse, amphibole, biotite, titanite and various accessory minerals.

Monzodiorites are known in transition zones within large granite massifs.

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