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Dickite: Al2Si2O5(OH)4 Ankerite: Ca(Fe++,Mg,Mn)(CO3)2 Sphalerite: (Zn,Fe)S
Comments: White, rhombohedral crystals of ankerite and dark gray, metallic sphalerite on beige dickite. Location: Prego mine, Kladno, Czech Rebublic. Scale: Picture size 2 cm. © Dave Barthelmy
Dickite: Al2Si2O5(OH)4
Comments: Porcelaneous pure white massive dickite. Location: Beaver County, Utah, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species