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Voltaite: K2Fe++5Fe+++3Al(SO4)12·18(H2O) Alunogen: Al2(SO4)3·17(H2O)
Comments: Dark greenish-black crystals of voltaite on white alunogen. Location: Carola Mine, Freital, Dresden, Saxony, Germany. Scale: Picture size 4 mm. © Thomas Witzke / Abraxas-Verlag
Voltaite: K2Fe++5Fe+++3Al(SO4)12·18(H2O) Szomolnokite: Fe++SO4·(H2O)
Comments: Whitish crystalline crust of voltaite on crystals of brown szomolnokite. Location: Alcaparrosa Mine, Cerritos Bayos, Chile. Scale: Picture size 1 cm. © John Veevaert