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March-April 2015

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Who's Who in Mineral Names: Edward S. Grew (b. 1944)

Edgrewite, Ca9(SiO4)4F2, is the fluorine dominant member of a series with hydroxyledgrewite, Ca9(SiO4)4(OH)2, the hydroxyl dominant member. Members of this series of humite-group calcium minerals are calcium analogues of the clinohumite-hydroxylclinohumite series, Mg9(SiO4)4(F,OH)2. Edgrewite was named in honor of Edward S. Grew, a well-known scientist in the areas of mineralogy and petrology at the University of Maine, Orono. Hydroxyledgrewite is the hydroxyl analogue of edgrewite.

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