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Stratlingite: Ca2Al[(OH)6AlSiO2-3(OH)4-3]·2,5(H2O)
Comments: Transparent blue-tinted platy stratlingite crystal aggregate in vug. Location: Bellerberg, Eifel, Rheinland-Pfalz, Germany. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species