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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