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Pokrovskite: Mg2(CO3)(OH)2·0.5(H2O) Hydromagnesite: Mg5(CO3)4(OH)2·4(H2O)
Comments: Tan spherical pokrovskite on serpentinite rock with white hydromagnesite sprays. Location: KCA Quarry, San Benito County, California, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species