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Ammonioalunite: (NH4)Al3(SO4)2(OH)6 Kaolinite: Al2Si2O5(OH)4
Comments: White chalky ammonioalunite on darker kaolinite.
Location: Schoeller Mine, Kladno, Stredocesky, Czech Republic.
Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species