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File:Carbonaceous shale mineralized with microscopic chalcocite (Nonesuch Formation, Mesoproterozoic; Upper Peninsula of Michigan, USA) 2.jpg

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English: Chalcocitic shale from the Precambrian of Michigan, USA. (public display, Geology Department, Wittenberg University, Springfield, Ohio, USA)

The ordinary-looking shale shown here comes from northern Michigan, from a 1.07 to 1.08 billion years old unit called the Nonesuch Formation (also known as the Nonesuch Shale). The unit is famous for having native copper mineralization. Copper was mined from cupriferous Nonesuch rocks at the White Pine Mine for many decades. Some rocks in the Nonesuch Formation experienced chalcocite mineralization, such as this specimen. Chalcocite is a copper sulfide mineral, Cu2S. It has a metallic luster and a dark gray color (see: www.flickr.com/photos/jsjgeology/albums/72157653197372478). The chalcocite in this shale is microscopic.

Stratigraphy: Nonesuch Formation, middle Oronto Group, upper Keweenawan Supergroup, upper Mesoproterozoic, ~1.07 to 1.08 Ga

Locality: unrecorded/undisclosed (but possibly from the White Pine Mine, Ontonagon County, eastern side of the Porcupine Mountains, northwestern Upper Peninsula of Michigan, USA; vicinity of 46° 45' 53.04" North latitude, 89° 33' 44.98" West longitude)
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Source https://www.flickr.com/photos/47445767@N05/27825524858/
Author James St. John

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This file is licensed under the Creative Commons Attribution 2.0 Generic license.
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/27825524858. It was reviewed on 26 March 2024 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

26 March 2024

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current16:53, 26 March 2024Thumbnail for version as of 16:53, 26 March 20243,521 × 1,275 (3.69 MB)Ser Amantio di Nicolao (talk | contribs)Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/27825524858/ with UploadWizard

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