n. Any of a class of metamorphic rock composed mainly of amphibole with some quartz etc.
the GNU version of the Collaborative International Dictionary of English
n. a metamorphic rock composed chiefly of amphibole and plagioclase.
The Century Dictionary and Cyclopedia
n. A rock belonging to the class of the crystalline schists, and consisting largely of green hornblende, together with quartz or feldspar, or both. It is always more or less distinctly in beds like gneiss.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. a metamorphic rock composed chiefly of amphibole and plagioclase
Word Usage
"The rugged, steeply sloping mountains are composed of Precambrian amphibolite and gneiss."