Abenakiite-(Ce) (or IMA 1991-054) is a mineral of sodium, cerium, neodymium, lanthanum, praseodymium, thorium, samarium, oxygen, sulfur, carbon, phosphorus, and silicon with a chemical formula Na26(Ce,Nd,La,Pr,Th,Sm)6-[O|SO2|(CO3)6|(PO4)6|Si6O18]. It is named after the Abenaki, an Algonquian Indian tribe of New England. Its Mohs scale rating is 4 to 5.
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