File:Thin Section of Hillhouse Gabbro - geograph 5888115.jpg
Thin_Section_of_Hillhouse_Gabbro_-_geograph_5888115.jpg (640 × 480 pixels, file size: 145 KB, MIME type: image/jpeg)
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Summary
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| Description |
English: Thin section of Hillhouse Gabbro from near Dundonald in Scotland. A photomicrograph of a petrographic section of the local rock, an analcime gabbro of Carboniferous age. The rock slice has been cut and lapped to 30 micrometres thickness, then photographed by a high-resolution camera attached to a polarising microscope. The false colours are caused by retardation of the polarised light which travels at different speed depending upon its alignment with the crystal axes. Perfectly isotropic materials are completely black, as are crystals whose axes align with the planes of polarisation. The colours enable geologists to identify the minerals of the rock - here pyroxene and olivine are bright, while plagioclase feldspar is humbug-striped. The length of the large, blue crystal is around 1.6mm. The section was prepared by the photographer in his own workshop/kitchen from material collected from Hillhouse Quarry (latitude 55:34.4379N, longitude 4:36.9120W). |
| Date | |
| Source | https://www.geograph.org.uk/photo/5888115 |
| Author | Jonathan Wilkins (https://www.geograph.org.uk/profile/7090) |
| Attribution (required by the license) | Jonathan Wilkins / Petrographic section, Hillhouse gabbro / |
| Object location |  | View this and other nearby images on: OpenStreetMap |  |
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Licensing
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This image was taken from the Geograph project collection. See this photograph's page on the Geograph website for the photographer's contact details. The copyright on this image is owned by Jonathan Wilkins and is licensed for reuse under the Creative Commons Attribution-ShareAlike 2.0 license.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 22:03, 3 March 2019 | | 640 × 480 (145 KB) | GeoWriter (talk | contribs) | User created page with UploadWizard |
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