On the basis of an analysis of Deering, New Hampshire material, sarcopside was assigned the formula (Fe, Mn, Ca) 7(PO4)2F2 (Holden, 1920), but Mrose and Appleman (1961) showed, on the basis of a structure analysis of Michelsdorf, Silesia material, that it has the formula (Fe, Mn, Ca)3(PO4)2. Thus it appears that either graftonite ((Fe, Mn, Ca)3(PO4)2) is a dimorph of sarcopside, or each is stable over some characteristic range of Fe, Mn, and Ca solid solution.

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