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Abenakiite-(Ce)

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Abenakiite-(Ce) (or IMA1991-054) Na26(Ce,Nd,La,Pr,Th,Sm)6-[O|SO2|(CO3)6|(PO4)6|Si6O18] is a mineral of sodium, cerium, neodymium, lanthanum, praseodymium, thorium, samarium, oxygen, sulfur, carbon, phosphorus, and silicon. It is named after the Abenaki, an Algonquian tribe of New England. Its Mohs scale rating is 4 to 5.