File:Calcite on chert breccia (Tri-State Mining District, Missouri, USA) 3.jpg

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English: (CMC RM1203, Cincinnati Museum of Natural History & Science, Cincinnati Museum Center, Cincinnati, Ohio, USA)

The dark orangish-brown mass is a large calcite crystal. Calcite is a common calcium carbonate mineral - CaCO3. It is the dominant component in common rocks like limestone and marble. This example is from Missouri's Tri-State Mining District.

The matrix / host rock seen at left is a chert breccia, a scarce lithology. Breccia is a poorly sorted rock with angular large grains. In this case, the large grains are composed of chert, a quartzose, cryptocrystalline sedimentary rock.

Locality: unrecorded/undisclosed site in the Tri-State Mining District, southwestern Missouri, USA
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Source https://www.flickr.com/photos/47445767@N05/49536999127/
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@N05/49536999127 (archive). It was reviewed on 15 February 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

15 February 2020

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current18:29, 15 February 2020Thumbnail for version as of 18:29, 15 February 20202,136 × 1,843 (2.68 MB)Ser Amantio di Nicolao (talk | contribs)User created page with UploadWizard

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