File:Uraniferous, pyritic, quartz-pebble conglomerate 10.jpg

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English: This rock does not have a label, but it's a crack sample of quartz-pebble conglomerate with detrital pyrite grains between the quartz pebbles (click on the photo once or twice to zoom in & see the brassy gold-colored pyrite). Detrital pyrite only occurred at Earth's surface in the early Precambrian, when the atmosphere had little to no free oxygen gas (O2). This rock is also radioactive - it contains uranium (probably detrital uraninite, UO2). Detrital pyrite and uraninite are classic pieces of geologic evidence for the lack of oxygen in early air. I suspect this sample comes from South Africa's Witwatersrand Group. If so, the rock may also be a gold ore.
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Source https://www.flickr.com/photos/47445767@N05/51191155868/
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@N05/51191155868. It was reviewed on 20 May 2021 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

20 May 2021

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current16:46, 20 May 2021Thumbnail for version as of 16:46, 20 May 20213,916 × 2,921 (9.61 MB)Ser Amantio di Nicolao (talk | contribs)Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/51191155868/ with UploadWizard

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