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amphibolite |
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amphiboliteIgneous 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. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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