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Swinefordite: (Li,Ca0.5,Na)0.72(Li,Al,Mg)2.66(Si,Al)4O10(OH,F)2·2(H2O)
Comments: Dark green leathery swinefordite coating on pegmatite. Location: Foote Mine, King's Mountain, Cleveland County, North Carolina, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species