A Geoscience Digital Image Library

TitleRhyolite conglomerate with native copper, Upper Penninsula, Michigan
DescriptionThis is a conglomerate from Michigan's Upper Penninsula. It contains mostly rhyolite and jasper pebbles. Native copper (tarnished to a dark color) is scattered in interstices between the pebbles. The Upper Penninsula of Michigan is known for its native copper deposits that occur in volcanic and sedimentary rocks of the Keweenawan Series of Late Precambrian age. A significant copper industry existed there in the mid to late 1800s but died out as other, shallower, copper deposits were found elsewhere.
LocationUSA ▹ Michigan. Lake Superior.
PhotographerDarla Sondrol. 2001-06-25.
CollectionUniversity of North Dakota Mineralogy Collection.
Key wordsnative copper, copper, conglomerate, Michigan
Tech details1022 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera; 60mm AF Nikon micro lens.
GeoDIL number848