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Arcanite: K2SO4
Comments: Opaque olive-green mottled-colored arcanite. Location: Tunnel #1, Santa Ana Tin Mine, Orange County, California, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Comments: SEM image of a sub-spherical aggregate of arcanite. Location: Ghar al Hibashi Harrat Nawasif/Al Buqum, Kingdom of Saudi Arabia. Scale: See Image. © Saudi Geological Survey