| P number: | P521396 |
|---|---|
| Caption: | Rock specimen of mica porphyry. Tairlaw Burn, Girvan Water, Ayrshire, Scotland. |
| Description: | The sample is a distinctive and brightly-coloured igneous rock composed of pink feldspar crystals enclosed within a fine-grained red-brown groundmass. The age of the rock is uncertain, it is possibly from a Silurian to Devonian calc-alkaline dyke suite. British Geological Survey Petrology Collection sample number EMC3178. The rock type is a porphyrite which is essentially a textural term used to describe a fine-grained igneous rock which contains large mineral crystals (phenocrysts) such as feldspar. A porphyritic rock can be of variable composition, and the term is often used in combination with a compositional term, for example 'porphyritic granite'. |
| Date taken: | Sun Dec 01 00:00:00 GMT 2002 |
| Photographer: | McTaggart, F.I. |
| Associate: | T.S. Bain |
| Copyright statement: | NERC |
| Additional information: | EMC3178 |
| Orientation: | Landscape |
| Size: | 304.52 KB; 1000 x 775 pixels; 85 x 66 mm (print at 300 DPI); 265 x 205 mm (screen at 96 DPI); |
| Average Rating: | Not yet rated |
| Categories: | Unsorted Images |
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