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Rosslerite: Mg(AsO3OH)·7(H2O)
Comments: Colorless crystals of rösslerite. Location: Jáchymov (St Joachimsthal), Krusné Hory (Erzgebirge), Západoceský Kraj, Bohemia, Czech Republic. Scale: Picture size 3.5 mm. © Thomas Witzke / Abraxas-Verlag