Roger Weller, geology instructor
firstname.lastname@example.org 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.
Photo is copyright free only for non-commercial educational uses.
Just credit photo to R.Weller/Cochise College.