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Szomolnokite: Fe++SO4·(H2O) Halotrichite: Fe++Al2(SO4)4·22(H2O)
Comments: Tan powdery szomolnokite crust on silky fibrous halotrichite with yellow metavoltine. Location: Markey Mine, Red Canyon, San Juan County, Utah, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Szomolnokite: Fe++SO4·(H2O) Voltaite: K2Fe++5Fe+++3Al(SO4)12·18(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