Dahl, Peter S. Department of Geology, Kent State University, Kent, Ohio.
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The group name for a family of minerals of general composition - (OH) which occur widely in metamorphic and igneous rocks (Fig. 1). Epidote [octahedral ferric iron (Fe3+) dominant] and clinozoisite [aluminum (Al) dominant] represent the most common compositions among the epidote group; a third composition, piemontite [manganese (Mn3+) dominant], is less abundant. Allanite refers to compositions displaying significant rare-earth (such as lanthanum or cerium) substitution for calcium (Ca2+), with corresponding replacement of Fe3+ by ferrous iron (Fe2+). A fifth member, zoisite, is equivalent to clinozoisite, but it has a different crystalline system. Rare epidote-clinozoisites abundant in chromium (Cr), vanadium (V), and lead (Pb) and allanites rich in fluorine (F), beryllium (Be), and phosphorus (P) also exist. See also: Crystal structure; Solid solution
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