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Paratsepinite-Ba: (Ba,Na,K)2-x(Ti,Nb)2(Si4O12)(OH,O)2·4(H2O)
Comments: Prismatic crystal aggregate of paratsepinite-Ba in pink eudialyte and dark brown acicular astrophyllite. Location: Lepkhe-Nel'm Mt., Seidozero Lake, Lovozero Massif, Kola Peninsula, Russia. Scale: Picture Size 6 mm. © Jeff Weissman / Photographic Guide to Mineral Species