Gratonite

Gratonite is a lead-arsenic sulfosalt mineral, with the chemical composition Pb₉As₄S₁₅. Gratonite was discovered in 1939 at the Excelsior Mine, Cerro de Pasco, Peru. It is named in honor of geologist L. C. Graton, who had a long-standing association with the Cerro de Pasco mines.

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