Lake Superior agate

Lake Superior Agate from the Lake Superior region in Northern Minnesota.

The Lake Superior agate is a type of agate stained by iron and found on the shores of Lake Superior. Its wide distribution and iron-rich bands of color reflect the gemstone's geologic history in Minnesota. In 1969 the Lake Superior agate was picked by the Minnesota Legislature as the official state gemstone.

References

• Minnesota's State Gem: The Lake Superior Agate