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ellestadite

A hexagonal mineral, Ca5(SiO4,PO4,SO4)3(F,OH,Cl) ; apatite group; it is chlorellestadite if (Cl>OH,F), fluorellestadite if (F>OH,Cl), or hydroxylellestadite if (OH>F,Cl). Hydroxylellestadite occurs as veinlets in blue calcite associated with wilkeite, idocrase, and similar contact metamorphic minerals at Crestmore, Riverside County, CA.

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  • ed.young
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