| P number: | P521393 |
|---|---|
| Caption: | Rock specimen of andalusite schist. At black shale outcrop, Knocknairling Burn, one mile south-west of north [New?] Galloway, Kirkcudbrightshire, Scotland. |
| Description: | The rock is a very fine-grained schist with a well-developed slaty cleavage. The cleavage surface is marked by a series of spots which represent the mineral andalusite. The rock will be Silurian in age. British Geological Survey Petrology Collection sample number EMC3786. Andalusite is a metamorphic mineral which characterises low grade thermally metamorphosed schists. It is normally grey in colour (though can be pink or reddish) and occurs as small square prisms or elongate laths. The intrusion of the granite pluton of Cairnsmore of Fleet has resulted in a surrounding metamorphic aureole where the adjacent rocks have been altered by the great amount of heat generated by the emplacement of the granite. Away from the intrusion the effect gradually declines. Highly metamorphosed sediments occur at Knocknairling Hill, argillaceous rocks pass into andalusite-mica-schists and gritty beds become quartz-mica-schists. |
| Date taken: | 01/12/2002 |
| Photographer: | McTaggart, F.I. |
| Associate: | T.S. Bain |
| Copyright statement: | NERC |
| Additional information: | EMC3786 |
| Orientation: | Portrait |
| Size: | 270.09 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: | Unsorted Images |
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