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Comments: Authigenic smectite (montmorillonite) overgrown on pore spaces and authigenicly-overgrown quartz grains in a sandstone. SEM image of a core sample.
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