| P number: | P521419 |
|---|---|
| Caption: | Rock specimen of felsitic sill. Shore between Corrygills and Brodick, Arran, Buteshire, Scotland. |
| Description: | The sample is a very pale-coloured fine-grained igneous rock. It has a uniform texture and is composed mainly of feldspar and quartz. British Geological Survey Petrology Collection sample number EMC1951. Felsite is a common general term for any light-coloured, fine-grained igneous rock which is composed dominantly of quartz and feldspar. In Arran, felsites form part of the minor intrusions of Tertiary age, where the spherulitic felsite is a devitrified or recrystallized volcanic glass containing peculiar spherical aggregates of radial fibres of intergrown feldspar and quartz. Sills along with dykes are very common igneous intrusions formed as sheet-like intrusions during the Tertiary Period. Sills differ from dykes in that the sheets of molten magma are intruded parallel to the layering of the intruded rocks while dykes cut across. |
| Date taken: | Sun Dec 01 00:00:00 GMT 2002 |
| Photographer: | McTaggart, F.I. |
| Associate: | T.S. Bain |
| Copyright statement: | NERC |
| Additional information: | EMC1951 |
| Orientation: | Landscape |
| Size: | 234.18 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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