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Monohydrocalcite: CaCO3·(H2O)
Comments: Gray to pale blue, due to copper staining, botryoidal monohydrocalcite crust. Location: 40' level, Saint Pierre Mine, Sainte-Marie-aux-Mines, Vosges Mountains, Haute-Rhin, France. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species