File:Sillimanite Crystals - geograph.org.uk - 746197.jpg
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| Description |
English: Sillimanite Crystals These tiny unobtrusive needle-like white crystals tell geologists about the history of this piece of rock. Sillimanite is one of three aluminium silicate minerals - the others are andalusite and kyanite - which have the same chemical composition, but take different forms according to the temperature and pressure they have been subjected to during metamorphism. The presence of these crystals tells us that these rocks have been heated to temperatures in excess of 550ºC during metamorphism, but not subjected to extreme pressures. |
| Date | |
| Source | From geograph.org.uk |
| Author | Anne Burgess |
| Attribution (required by the license) | Anne Burgess / Sillimanite Crystals / |
| Camera location |   | View this and other nearby images on: OpenStreetMap |  |
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| Object location | | View this and other nearby images on: OpenStreetMap | |
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_heading:270.00&language=en){kind=link}
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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 Anne Burgess and is licensed for reuse under the Creative Commons Attribution-ShareAlike 2.0 license.
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This file is licensed under the Creative Commons Attribution-Share Alike 2.0 Generic license.
Attribution: Anne Burgess
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 12:33, 19 February 2011 | | 640 × 455 (308 KB) | GeographBot (talk | contribs) | == {{int:filedesc}} == {{Information |description={{en|1=Sillimanite Crystals These tiny unobtrusive needle-like white crystals tell geologists about the history of this piece of rock. Sillimanite is one of three aluminium silicate minerals - the others a |
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