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Metavoltine: K4Na4(Fe++,Zn)Fe+++6(SO4)12O2·20(H2O) Alunogen: Al2(SO4)3·17(H2O)
Comments: Yellow metavoltine with white alunogen.
Location: Carola Mine, Freital, near Dresden, Saxony, Germany.
Scale: Picture size 5 mm.
© Thomas Witzke / Abraxas-Verlag