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About Our Definitions: All forms of a word (noun, verb, etc.)
are now displayed on one page. Definition of AMPHIBOLITE : a
usually metamorphic rock consisting essentially of amphibole
First Known Use of 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 (seeacid and basic rocks) can be the
parent rocks of amphibolite.