| P number: | P524398 |
|---|---|
| Caption: | Photomicrograph of crenulated semipelitic schist. Light: XPL, Magnification x 2. Allt a' Choire, 30 metres west of junction with River Livet, Tomnavoulin, Aberdeenshire. |
| Description: | The image shows a photomicrograph of a crenulated semipelitic schist, taken under crossed-polarized light to highlight the different mineral types in the rock. British Geological Survey Petrology Collection sample number S 75752. Light: XPL, Magnification x 2. Light: XPL, Magnification x 2. The brightly-coloured mineral which dominates the rock is muscovite mica. It forms small elongate flakes which are aligned in a series of parallel folds or crenulations. The other main mineral phases in the rock are quartz and feldspar, which have a more granular shape and variable grey birefringence colours. A crenulation is a small-scale folding with a wavelength of up to a few millimetres that is generally associated with larger-scale folds. Crenulations are commonly associated with the development of planes of cleavage in a rock. |
| Date taken: | Wed Jan 01 00:00:00 GMT 2003 |
| Photographer: | Hyslop, E.K. |
| Copyright statement: | NERC |
| X longitude/easting: | 321340 |
| Y latitude/northing: | 826100 |
| Coordinate reference system, ESPG code: | 27700 (OSGB 1936 / British National Grid) |
| Orientation: | Landscape |
| Size: | 405.02 KB; 1000 x 667 pixels; 85 x 56 mm (print at 300 DPI); 265 x 176 mm (screen at 96 DPI); |
| Average Rating: | Not yet rated |
| Categories: | Best of BGS Images/ Rocks and minerals under the microscope |
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