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.
Rocks in the north and west Tait Lake area consist of biotite-quartz-feldspar and amphibolitic paragneiss that have been intruded by white to pink medium-grained granitic rocks.
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.
Numerous zones that yield radiometric readings of 300 to 2,500 cps hosted within medium-grained granite and coarse-grained quartz-feldspar pegmatitic dykes that crosscut biotite-quartzo-feldspathic to biotite-quartz-feldspar amphibolitic gneiss.