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Simmonsite: Na2LiAlF6
Comments: Backscattered electron images of primary assemblage of cryolite-cryolithionite (cl) simmonsite (sm) and trace elpasolite (ep). (AmMin, v 84, p 770). Location: Zapot amazonite-topaz-zinnwaldite pegmatite located in the Gillis Range, Mineral Co., Nevada, USA. Scale: See Image. © American Mineralogist