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Check the listing for details. monzosyenite - hand specimen from the Laramie anorthosite complex. Listed at 10.45 USD. Monzosyenite is a synonym of monzonite. It has very little quartz, if any at all. Notice its position on the QAPF diagram. monzo syenite instead of syenite?. Syenite is defined as a potassium feldspar (orthoclase)-rich rock with minor amounts of albite, a plagioclase feldspar.