A metamorphic rock composed mainly of epidote and quartz, formed from the alteration of other igneous rocks.
From epidote + '-ite' (mineral suffix), indicating a rock whose primary component is epidote. This geological term became standard in 19th-century mineralogy.
Epidosite is the geological equivalent of an 'epidote-heavy' rock—it's so packed with epidote minerals that scientists just named the whole rock after its main ingredient!
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