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Jachymovite: (UO2)8(SO4)(OH)14·13(H2O)
Comments: Yellow crystals of jáchymovite. Location: Jáchymov (St Joachimsthal), Krusné Hory (Erzgebirge), Západoceský Kraj, Bohemia, Czech Republic. Scale: Picture size 3 mm. © Thomas Witzke / Abraxas-Verlag