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Claudetite: As2O3 Arsenic: As
Comments: Colorless prismatic crystal of claudetite on native arsenic. Location: Jáchymov (St Joachimsthal), Krusné Hory (Erzgebirge), Západoceský Kraj, Bohemia, Czech Republic. Scale: Picture size 2 mm. © Thomas Witzke / Abraxas-Verlag