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Walthierite: Ba0.5Al3(SO4)2(OH)6
Comments: SEM BSE image of subhedral and euhedral walthierite (light gray) enclosed within alunite (dark gray). (AmMin, v77:1275). Location: El Indio gold, silver, and copper deposit, Tambo mining district, Coquimbo region, Chile. Scale: See Image. © American Mineralogist