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Pickeringite: MgAl2(SO4)4·22(H2O) Magnesioaubertite: (Mg,Cu)Al(SO4)2Cl·14(H2O)
Comments: Aqua crystalline magnesioaubertite with white pickeringite. Location: Grotto di Faraglione, Vulcano, Sicily, Italy. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Pickeringite: MgAl2(SO4)4·22(H2O)
Comments: Radiating fibrous pickeringite. Location: Patagonia, Santa Cruz County, Arizona, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species