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Foitite: [ ]Na<0.5(Fe++,Al)3Al6Si6O18(BO3)3(OH)4
Comments: Dark greenish-black termination of foitite on pinkish elbaite. Location: Dobra Voda, Moravia, Zapadocesky, Czech Republic. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species