| P number: | P524401 |
|---|---|
| Caption: | Photomicrograph of biotite schist. Light: PPL, Magnification x 10. Craigbeg, Glen Spean, Invernessshire. |
| Description: | The image is a thin section photomicrograph of part of a semipelitic rock known as a biotite schist. British Geological Survey Petrology Collection sample number S 76886. Light: PPL, Magnification x 10. Light: PPL, Magnification x 10. The rock is composed of vivid red-brown biotite mica and pale quartz and feldspar. The biotite forms elongate flakes which are aligned to define a strong fabric in the rock. The quartz and feldspar grains are more granular, although they are also deformed along the fabric and commonly ovoid in shape. The term schist is commonly applied to many metamorphic rocks in the Highlands of Scotland. It is used to describe a strongly foliated crystalline rock formed by dynamic metamorphism, that can be readily split into thin flakes or slabs due to the well developed parallelism of more than 50% of the minerals present, particularly those of lamellar or elongate prismatic habit such as mica. The mineral composition is not an essential factor as the term refers purely to the textural aspects of the rock. |
| Date taken: | Wed Jan 01 00:00:00 GMT 2003 |
| Photographer: | Hyslop, E.K. |
| Copyright statement: | NERC |
| X longitude/easting: | 240650 |
| Y latitude/northing: | 781600 |
| Coordinate reference system, ESPG code: | 27700 (OSGB 1936 / British National Grid) |
| Orientation: | Landscape |
| Size: | 304.09 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: | Unsorted Images |
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