Lake Superior Agate

Minnesota State Gemstone

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Lake Superior agate

Lake Superior agate; photo © Scenes & Seens (all rights reserved; used by permission).

Lake Superior Agate

Minnesota designated Lake Superior agate as the official state gemstone in 1969. An unusually beautiful quartz stone banded with rich red and orange colors (derived from iron ore in the soil), Lake Superior agates were dispersed by glaciers in the last Ice Age. Found in northeastern and north central Minnesota, most Lake Superior agates are pea-size but some are as big as bowling balls and weigh over 20 pounds.

Minnesota

Images

Lake Superior "Cat Head" Agate found near Mora, MN; photo by Captain Tenneal on Flickr (noncommercial use permitted with attribution / no derivative works).

Lake Superior agate