File:Precambrian Granite St Francis Mountains Missouri.jpg

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DescriptionPrecambrian Granite St Francis Mountains Missouri.jpg Precambrian granite from St. Francois Mountains, Missouri, U.S.A., showing potassium

Found in articles

DescriptionPrecambrian Granite St Francis Mountains Missouri.jpg Precambrian granite from St. Francois Mountains, Missouri, U.S.A., showing potassium