Agate

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Agate SiO2 I, Lake Superior, Marquette, Michigan

Agate SiO2 Brazil

Agate SiO2 II, Lake Superior, Marquette, Michigan

Agate SiO2 III, Lake Superior, Marquette, Michigan

Agate SiO2 IV, Lake Superior, Marquette, Michigan

Agate SiO2

"Bacon" Agate SiO2 Lake Superior, Marquette Co., Michigan

Agate SiO2 V, Lake Superior, Marquette Co., Michigan

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