LAKE SUPERIOR AGATES FOR SALE

Lake Superior agate is a variety of agate collected throughout Minnesota. It commonly features concentric banding colored red, orange, yellow, and white by iron impurities. This makes sense considering iron is a major industrial mineral found throughout the Cuyuna, Mesabi, Vermillion, and Gunflint Iron Ranges that make up much of the northeastern region of Minnesota, along one side of Lake Superior. They formed when silica/iron-rich fluids deposited within vesicular pockets created by gas expansion within lava rock as it cooled. Over time, the agate nodules eroded out of the rock and were naturally dispersed by glacial activity throughout multiple regions of Minnesota, Iowa, Kansas, Michigan, Nebraska, and Wisconsin. It is such a prominent mineral with a rich and telling history that it was designated as the official state gemstone of Minnesota.