Webster's Online Dictionary
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Specialty Definition: EPIDIORITE

DomainDefinition
MiningA metamorphosed gabbro or diabase in which generally fibrous amphibole (uralite) has replaced the original clinopyroxene (commonly augite). It is usually massive but may have some schistosity. See also: epidiabase. (references)
WikipedicEpidiorite is a family of rocks consisting of metamorphosed forms of gabbro or diabase in which the original clinopyroxene (most often augite) has been replaced by the fibrous amphibole uralite. Epidiorites are generally homogenous but may include schists. (references)

Source: compiled by the editor from various references; see credits.

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