Roger Weller, geology instructor
email@example.com copyright 2010-R.Weller
thomsonite in basalt-1
The mineral filling the vesicles in the basalt is thomsonite, a zeolite with a radiating
structure. As the lava is weathered, the thomsonite nodules show up as beach
pebbles along the western shore of Lake Superior.
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Just credit photo to R.Weller/Cochise College.