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Nesquehonite: Mg(HCO3)(OH)·2(H2O)
Comments: Scanning electron micrographs of nesquehonite clusters showing the typical elongated habit. (AmMin, 88:1882). Location: Crystals associated with the remains of a saguaro, Carnegiea gigantea from south and west central Arizona. Scale: Scale Bar 50 µ-m (lower left). © American Mineralogist