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Langite: Cu4(SO4)(OH)6·2(H2O)
Comments: Bluish, tabular blades of twinned langite crystals on matrix. Location: Mollau, France. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Comments: Encrustation of small (less than one mm.) sky blue langite crystals, on matrix. Location: Lubietova, Slovakia. Scale: Picture size 1.5 cm. © Sandro Maggia/Minernet.it