Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A metamorphic rock composed chiefly of amphibole and plagioclase feldspar and having little or no quartz.
from The Century Dictionary.
- noun 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.
from the GNU version of the Collaborative International Dictionary of English.
- noun a metamorphic rock composed chiefly of amphibole and plagioclase.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun geology Any of a class of
metamorphic rock composed mainly ofamphibole with somequartz etc.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun a metamorphic rock composed chiefly of amphibole and plagioclase
Etymologies
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Examples
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The amphibolite, a metamorphosed black volcanic rock, formed from lavas that spilled on the floor of a shallow sea, mixing with layers of mud, sand, and volcanic ash.
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The rugged, steeply sloping mountains are composed of Precambrian amphibolite and gneiss.
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The surroundings are low heavily glaciated PreCambrian gneiss and amphibolite rocks extending some 50 km inland to the ice cap with flanking lateral moraines and ice-dammed lakes; also lakelets, glacial striations, roches moutonées, and perched erratics typical of glaciated landscapes.
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Gneiss and schists containing relatively uniform micas, with important amphibolite inclusions, are the dominant metamorphic rocks.
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The summits of Grünhorn and Finsteraarhorn are composed of green amphibolite, a very hard rock.
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To further muddy the waters introduce the idea of gas fugacity – given constant P and T, greenschist assemblages can be amphibolite simply by increasing O2 fugacity.
Hansen and Schmidt: Predicting the Past? « Climate Audit 2006
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_ -- The whole formation is Archean and Primary (with a few modern plutonic outbursts), and chiefly consists of granite, felspar, quartz, gneiss, schists, amphibolite and other Archean rocks, with Primary sandstones and limestones in the basin of Lake Nyasa (a great rift depression), the river Shiré, and the regions within the northern watershed of the Zambezi river.
Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3 "Brescia" to "Bulgaria" Various
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These porphyries are pierced by greenstone two or three feet thick, and the granites are intersected by numerous veins of amphibolite
Rambles in the Islands of Corsica and Sardinia with Notices of their History, Antiquities, and Present Condition. Thomas Forester
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The best specimens are afforded by the beautifully developed transparent glassy crystals, found with albite, prehnite and quartz, in a zone of amphibolite and chlorite-schists at Le Bourg d'Oisans in Dauphiné.
Encyclopaedia Britannica, 11th Edition, Volume 3, Part 1, Slice 1 "Austria, Lower" to "Bacon" Various
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Along Grand Lake the rock is a compact amphibolite [3] with a strike
The Long Labrador Trail Dillon Wallace 1901
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