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Amarillite: NaFe+++(SO4)2·6(H2O)
Comments: Yellowish white, powdery crystals of amarillite crystals. Location: Grotta de Faraglione, Porte de Levante, Island de Vulcano, Italy. Scale: Specimen Size 15 x10 x 7 mm. © Sergey Vasiliev / Systematic Mineralogy