from The American Heritage® Dictionary of the English Language, 4th Edition
- n. An igneous rock composed chiefly of plagioclase and orthoclase, with small amounts of other minerals.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. An intrusive igneous rock composed mostly of plagioclase and orthoclase
from The Century Dictionary and Cyclopedia
- n. In petrography, a phaneric igneous rock intermediate in composition between syenite and diorite, that is, composed of alkali feldspar, usually orthoclase, and lime-soda feldspar, andesin or labradorite, in equal or nearly equal proportions, with subordinate amounts of hornblende, pyroxene, or mica, rarely olivin, and minor constituents. There may be a variable amount of quartz: when it is present in considerable amount the rock is quartz-monzonite or granodiorite.
French, after Mount Monzoni in northeast Italy.(American Heritage® Dictionary of the English Language, Fourth Edition)
From Monzoni in the Italian Tyrol (Wiktionary)