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Lake Superior Agates - found on both north (MN) and south (WI) shores of Lake Superior. - Agates are semi precious stones so common on Lake Superior beaches no one pays much attention.

from eHow

How to Identify Lake Superior Agates

Search for Lake Superior agates in surrounding areas with many pebbles and rocks.

Agate Hunting Made Easy: How to Really Find Lake Superior Agates by James Magnuson