An igneous rock composed chiefly of plagioclase feldspar and orthoclase, with small amounts of other minerals.
A dark-colored, intrusive igneous rock containing orthoclase and plagioclase in nearly equal quantities, a small amount of quartz, and some biotite.
An igneous rock composed chiefly of plagioclase and orthoclase, with small amounts of amphibole, pyroxene, and biotite. Monzonite contains little or no quartz.
Origin of monzonite
- French after Mount Monzoni in northeast Italy
From American Heritage Dictionary of the English Language, 5th Edition
- From Monzoni in the Italian Tyrol