Amphibolite

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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.