Amphibolite

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Related to amphibolitic: Amphibolite Facies

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.

References in periodicals archive ?
2006 Compositional features and petrogenetic affinity of Precambrian amphibolitic schists of Sepeteri area, southwestern Nigeria.
Still downwards, the rock consist of a feldspathic groundmass with a texture close to nebulitic in which only very thin amphibolitic films occur, corresponding to (or transposed into) schistosity planes, and offoliated hololeucocratic granite.
Moore (1986) mentions amphibolitic "blocks" with Na-pyroxene replaced by barroisitic amphibole in some samples.
Prehnite occurs at La Combe de la Selle in isolated and intergrown crystals to 5 cm on amphibolitic matrix.
The local series is composed of the metamorphic rocks, mostly sericite-phyllites, chloritic and amphibolitic schists.
The Rocky Lakes suite as herein defined comprises pink to greenish-grey, medium- to coarse-grained, porphyritic to equigranular granite and grey to green, medium- to coarsegrained, granodiorite, tonalite and quartz diorite cut by numerous massive to amphibolitic mafic dykes.
The formation of vanadinite is attributed to the supergene alteration of galena in combination with groundwater leaching of vanadium from the neighboring amphibolitic country rocks.