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Shuiskite: Ca2(Mg,Al)(Cr,Al)2(SiO4)(Si2O7)(OH)2·(H2O)
Comments: Acicular shuiskite microcrystal sprays with epidote and prehnite. Location: Quincy Mine, Hancock, Houghton County, Michigan, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species