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Mutnovskite: Pb2AsS3(I,Cl,Br)
Comments: SEM of blocky crystals of mutnovskite. Needle-like crystals of unknown Pb-Bi-As halogensulfosalts, currently under study, appear on the left. AmMin, v91, p22. Location: Mutnovsky volcano, Kamchatka Peninsula, Russian Federation. Scale: See Image. © American Mineralogist