| P number: | P521449 |
|---|---|
| Caption: | Rock specimen of garnet mica schist. North of Allt a' Chaorinn, 3.5 miles south-south-east of Inverlochy, Argyllshire, Scotland. |
| Description: | The rock has a reflective planar surface, a schistosity, formed by the alignment of mica minerals, mainly muscovite, and studded with small dark spherical garnets. The schistosity has been affected by subsequent deformation, producing a series of oblique lineation on the surface, picked out by the mica. British Geological Survey Petrology Collection sample number EMC800. A schistosity is a foliation in a schist caused by the parallel or planar arrangement of platy or prismatic minerals, usually mica. It is considered by some to be a type of cleavage. Garnet mica schist is one of the most common regional metamorphic rocks in the Scottish Highlands, both north and south of the Great Glen. It is formed from the recrystallisation of sedimentary rocks such as impure (muddy) sandstones at moderate to high grades of regional metamorphism. The rock will be Precambrian in age. |
| Date taken: | Sun Dec 01 00:00:00 GMT 2002 |
| Photographer: | McTaggart, F.I. |
| Associate: | T.S. Bain |
| Copyright statement: | NERC |
| Additional information: | EMC800 |
| Orientation: | Portrait |
| Size: | 316.48 KB; 775 x 1000 pixels; 66 x 85 mm (print at 300 DPI); 205 x 265 mm (screen at 96 DPI); |
| Average Rating: | Not yet rated |
| Categories: | Best of BGS Images/ Geological structures |
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