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Montmorillonite: (Na,Ca)0,3(Al,Mg)2Si4O10(OH)2·n(H2O)
Comments: Authigenic smectite (montmorillonite) overgrown on pore spaces and authigenicly-overgrown quartz grains in a sandstone. SEM image of a core sample. Location: Unknown. Scale: Picture size 67 µ-m. © OMNI Laboratories, Inc
Comments: Bright pink chalky massive montmorillonite. Location: Tamminen Quarry, Greenwood, Oxford County, Maine, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species