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Lake Superior Agate nodule This is a original un-altered nodule with great fortified bands and a floater center. Pictures taken of stone dry and wet. Stone Dimensions: 1-1/2" Long x 3/4" Tall x 1/2" Thick Thank you for looking. THIS IS AN UNFINISHED PRODUCT IT MAY CONTAIN CHIPS, CRACKS, SAW MARKS, AND BLEMISHES. Lake Superior agates are a type of agate found near Lake Superior, known for their rich red, orange, and yellow banding, caused by iron oxidation. These gemstones formed within basaltic lava flows about 1.1 billion years ago and were later dispersed by glacial activity. They are the official state gemstone of Minnesota.