Thomsonite Subgroup, Thomsonite-Ca
Thomsonite beach, Grand Marais, Cook County, Minnesota, USA
A STRIKING buffed and sawed specimen of a 2.3 cm, banded, birds-eye, thomsonite-lintonite nodule nicely set in amygdaloidal matrix from the Grand Marais on the North Shore of Lake Superior, Minnesota. Thomsonite and lintonite are zeolites. Ex Richard Hauck Collection. 3.6 x 3.6 x 2.8 cm
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