Thomsonite

specimen number:
2062370

location:
Grand Marais, Minnesota, USA

description:
Classic Minnesota specimen with a colorful banded natural of thomsonite 2.2 cm across and polished coming off matrix.

Grand Marais, Minnesota, is a historic harbor community along Lake Superior that began developing as a fur trading post and fishing village in the late 18th to mid-19th centuries, eventually incorporating as a village in 1893. Geologically, the region is defined by ancient Precambrian volcanic activity and continental rifting from over one billion years ago, which produced extensive basaltic lava flows. Within the gas vesicles and cavities of these ancient lava rocks, the zeolite mineral thomsonite formed through hydrothermal fluid activity, yielding unique multicolored, eye-patterned gem nodules along the North Shore.

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