$300Median
105Sold (12 mo)
$250Last sale
Updated 22h ago
Thomsonite set
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- Seller offers an extended return window of up to 14 days
Ships from USA
A set of thomsonite nodules from this classic area for the species. Some are tumble polished. Size provided for the largest example.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.
Product details
SpeciesThomsonite
SizeMiniature
Dimensions3.3 x 2.6 x 1.0 cm
Listed on09/17/2026
LocalityGrand Marais, Minnesota, USA
SKU1791322
Current owner
WM
Weinrich MineralsFeatured
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