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Lake Superior Agate Formation and Geography

Lake Superior Agates formed a billion years ago from volcanic activity in the Lake Superior Region. This allowed silified water into pockets of rhyolite and basalt. The granular details of how the agates form in the host rock is still unkown. A great read on agate formation and chrystallography can be found here.

Since their formation, a large portion of the agates have been carried by glaicers and processes of erosion south of Lake Superior. Some have even made it to the very end of the Mississippi River.

Identifying Lake Superior Agates

Lake Superior Agates or agates in general have a variety of characteristics that separate them from other rocks.