Beautiful chunk of rough Thomsonite in basalt matrix, hand collected by me on the shores of Lake Superior in Minnesota.

This one chunk has MULTIPLE larger patches of Thomsonite as well as a bunch of smaller nodules all over the surface and presumably throughout. Great to work with to remove the Thomsonite for jewelry or craft projects or just enjoy as is in its current natural state.

Gorgeous - see pics for size and weight

Pictured dry and wet in sunlight.