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Minnesota's largest celebration of the state gem - the Lake Superior agate - returns to Moose Lake this weekend with the Agate Days celebration Saturday and Sunday.

For those unfamiliar with our famous stone, the Lake Superior agate was named the official state gemstone in 1969. It is an unusually beautiful quartz stone banded with rich red and orange colors derived from iron ore in the soil. Most agates are about the size of a pea, but some are as big as bowling balls and weigh more than 20 pounds.

So hurry down to Moose Lake State Park to see the largest known Lake Superior agate, at the...