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Alunogen: Al2(SO4)3·17(H2O) Jarosite: KFe+++3(SO4)2(OH)6
Comments: Colorless to white, tabular crystals alunogen on reddish jarosite. Location: Ronneburg U deposit, Gera district, Thuringia, Germany. Scale: Picture size 5 mm. © Thomas Witzke / Abraxas-Verlag
Alunogen: Al2(SO4)3·17(H2O) Metavoltine: K4Na4(Fe++,Zn)Fe+++6(SO4)12O2·20(H2O)
Comments: Yellow metavoltine with white alunogen. Location: Carola Mine, Freital, near Dresden, Saxony, Germany. Scale: Picture size 5 mm. © Thomas Witzke / Abraxas-Verlag
Alunogen: Al2(SO4)3·17(H2O) Voltaite: K2Fe++5Fe+++3Al(SO4)12·18(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