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Barringtonite: MgCO3·2(H2O) Lansfordite: MgCO3·5(H2O)
Comments: Optical images of clusters of glassy lansfordite crystals and one white dehydrated barringtonite ? crystal. (AmMin, 88:1883). Location: Crystals associated with the remains of a saguaro, Carnegiea gigantea from south and west central Arizona. Scale: Scale bar 800 µ-m. © American Mineralogist