isotypy

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• Robertsite — Robertsite, Ca6Mn9(PO4)9O6(H2O)6·3(H2O) (alternatively formulated Ca2(Mn3(PO4)3O2)(H2O)3), is a secondary phosphate species named for Willard Lincoln Roberts (1923 1987), mineralogist and professor who taught at South Dakota School of Mines in… …   Wikipedia