A rare arsenic oxide mineral with the chemical formula As₂O₃, typically found in oxidized arsenic deposits.
Named after Pierre Eugène Claude Marchand, a 19th-century French chemist, following the standard mineralogical naming convention of naming minerals after scientists.
Claudetite is so rare that most geologists will never see a real specimen—it forms only under very specific conditions in arsenic-rich ore deposits, making it a prized collectible for mineral enthusiasts.
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