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Tschortnerite: Ca4(Ca,Sr,K,Ba)3Cu3(OH)8[Si12Al12O48]·x(H2O), x>=20
Comments: Scanning electron micrograph of tschortnerite. (AmMin 83:608). Location: Ca-rich xenolith at the Bellberg volcano near Mayen, Eifel, Germany. Scale: Scale Bar 20 µm. © American Mineralogist