Thomsonite Ring TN-24 Size 8.5


Thomsonite Ring TN-24 Size 8.5

Thomsonites, one of the rarer zeolite minerals, have been collected as gemstones from a series of lava flows along Lake Superior in Minnesota and to a lesser degree in the Keweenaw Peninsula of Michigan. Thomsonite nodules can be found still embedded in basaltic matrix rock, or loose along the shoreline in areas where they have eroded from the basalt. Some nodules have copper inclusions and rarely will be found with copper "eyes." When polished thomsonites sometimes (not always)display a "cat's eye" effect (chatoyancy). It's luster is pearly to subvitreous.

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