File:Dolomite-cemented dolostone breccia 6.jpg
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editDescriptionDolomite-cemented dolostone breccia 6.jpg |
English: (cut surface)
Dolostone is a chemical sedimentary rock composed of the mineral dolomite (CaMg(CO3)2 - calcium magnesium carbonate). Like limestone and calcite, dolostone and dolomite will readily bubble in acid, but only when powdered. Dolostone can be jokingly described as the “ultimate non-descript rock”. It often looks like driveway gravel. Well, there’s a reason for this - a lot of driveway gravel is dolostone (at least in the part of the world where I live). Many dolostones are grayish, microcrystalline-textured, and have vuggy porosity. Vugs are irregularly-sized and irregularly-shaped cavities. Some dolostones are fossiliferous. Fossiliferous dolostones usually have poorly-preserved fossil “ghosts”. Rarely, fine-grained dolostones have soft-bodied fossil preservation. Crystalline-textured dolostones appear secondary in origin. They are typically interpreted as chemically-altered fossiliferous limestones. Some dolostones look primary, but how they formed is not entirely clear. Chemically, all that's needed to form dolostone is the addition of magnesium (Mg) to limestone. The details of this chemical change are not fully understood. A few localities on Earth do have dolomite or protodolomite forming now, but the detailed story of the dolomite-forming process is still a significant unsolved problem in sedimentary geology - “the dolomite problem”. Seen here is a dolostone breccia - the dark-colored, angular pieces are thinly-laminated dolostone clasts. The dolostone fragments are cemented together with pale pinkish-colored, coarsely-crystalline dolomite. This specimen has no provenance information, but it's probably from midwestern America. It may be a fault breccia. |
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Source | https://www.flickr.com/photos/47445767@N05/53178747580/ |
Author | James St. John |
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/53178747580. It was reviewed on 11 September 2023 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
11 September 2023
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current | 07:40, 11 September 2023 | ![]() | 3,857 × 2,224 (5.96 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/53178747580/ with UploadWizard |
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Camera manufacturer | Canon |
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Camera model | Canon PowerShot D10 |
Exposure time | 1/60 sec (0.016666666666667) |
F-number | f/11 |
ISO speed rating | 80 |
Date and time of data generation | 21:45, 2 September 2023 |
Lens focal length | 11.614 mm |
Width | 4,000 px |
Height | 3,000 px |
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Pixel composition | RGB |
Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
Software used | Adobe Photoshop Elements 20.0 (Macintosh) |
File change date and time | 01:47, 10 September 2023 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 21:45, 2 September 2023 |
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Image compression mode | 3 |
APEX shutter speed | 5.90625 |
APEX aperture | 6.90625 |
APEX exposure bias | −1 |
Maximum land aperture | 4 APEX (f/4) |
Metering mode | Pattern |
Flash | Flash fired, compulsory flash firing, red-eye reduction mode |
Supported Flashpix version | 1 |
Color space | sRGB |
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Focal plane resolution unit | inches |
Sensing method | One-chip color area sensor |
File source | Digital still camera |
Custom image processing | Normal process |
Exposure mode | Manual exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Scene capture type | Standard |
Lens used | 6.2-18.6 mm |
Date metadata was last modified | 21:47, 9 September 2023 |
Unique ID of original document | 93C8C8A592DCC32B1083CBF2B541A38A |