Lake Superior agate
Lake Superior agate
Type of iron-colored agate.
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Readers' pathsAug 2026 – Oct 2026
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Agate
Banded variety of chalcedony.
55%
Midcontinent Rift System
Geological rift in the center of the North American continent.
12%
Keweenaw Peninsula
Northernmost part of the Upper Peninsula of Michigan, United States.
12%
Chalcedony
Microcrystalline or cryptocrystalline form of silica.
7.5%
Cabochon
Gemstone that has been shaped and polished.
6.9%
Silicate mineral
Rock-forming minerals with predominantly silicate anions.
3.2%
Basalt
Magnesium- and iron-rich extrusive igneous rock.
2.9%
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