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Amphibolite

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amphibolite

Igneous or metamorphic rock composed largely or dominantly of amphibole minerals. For igneous rocks, the term hornblendite is usually used and is more restrictive; hornblende is the most common amphibole. Metamorphic amphibolites are more widespread and variable than igneous ones. Typically, they are medium- to coarse-grained and are composed of hornblende and plagioclase. Basic igneous rocks such as basalts and gabbros (see acid and basic rocks) can be the parent rocks of amphibolite.

amphibolite [am′fib·ə‚līt]
(petrology)
A crystalloblastic metamorphic rock composed mainly of amphibole and plagioclase; quartz may be present in small quantities.
Amphibolite 

a schistose metamorphic rock composed chiefly of alumina-bearing amphibole (hornblende) and plagiociase; sometimes contains granite. Amphibolite is formed from various matrices subjected to profound metamorphism sometimes accompanied by metasomatism and the introduction of silica, magnesium, and iron. Some black varieties of amphibolite are used as industrial gems and ashlars.
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The Slide Mountain Terrane (hanging wall) comprises the Crooked Amphibolite in the southwest and the Antler assemblage in the northeast (Figs.
Great Mining Camps of Canada 3. The History and Geology of the ... by Brown, Atholl Sutherland; Ash, Chris H. / Geoscience Canada
Her means are modest: Handsome chunks of breccia, amphibolite, and serpentine rocks, collected above the Arctic Circle, nest on the artist's own folded clothing.
Helen Mirra; Galerie nordenhake by Jones, Ronald / Artforum International
basalts, diabases, amphibolites, gneisses, gabbros, quartzites, melaphyres, porphyries and keratophyries, serpentinites, limestones, sandstones, and dolomites), as well as in the cement and lime industry (limestones and marls).
Some problems of sustainable management of mineral resources in ... by Radwanek-Bak, Barbara / Estonian Journal of Earth Sciences
 
 
 
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