File:Fluorite-barite on fossiliferous dolostone (Columbus Limestone, Middle Devonian; Ottawa County, Ohio, USA) 2.jpg

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English: Fossiliferous dolostone with encrusting fluorite and barite from the Devonian of Ohio, USA.

This interesting specimen principally consists of grayish-colored rock, which is fossiliferous dolostone. Dolostone is a crystalline-textured chemical sedimentary rock composed of the mineral dolomite (calcium magnesium carbonate, CaMg(CO3)2). Most dolostone forms by chemical alteration of limestone. The whitish and purplish material is mineralization that grew on the external mold of a fossil rugose coral in the dolostone. The whitish areas are the mineral barite (barium sulfate, BaSO4). The purplish areas are the mineral fluorite (calcium fluoride, CaF2).

Stratigraphy: Columbus Limestone, Eifelian Stage, lower Middle Devonian

Locality: undisclosed site in Ottawa County (likely a quarry), northern Ohio, USA
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Source https://www.flickr.com/photos/47445767@N05/51995690927/
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@N05/51995690927. It was reviewed on 11 April 2022 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

11 April 2022

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current20:20, 11 April 2022Thumbnail for version as of 20:20, 11 April 20222,894 × 2,047 (4.49 MB)Ser Amantio di Nicolao (talk | contribs)Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/51995690927/ with UploadWizard

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