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Farneseite: (Na37K9Ca10)S56(Si42Al42)S84O168(SO4)12·6(H2O)
Comments: Crystal cluster of farneseite. Shown are the hexagonal truncated pyramid habit and terminations crossed by striations.. Location: Farnese, Viterbo province, Latium, Italy. Scale: Crystal size 1.2 mm. © Gruppo Mineralogico Romano