| P number: | P521299 |
|---|---|
| Caption: | Rock specimen of hypersthene-granophyre. Roadside north of An Dornabac, Rum, Argyllshire, Scotland. |
| Description: | The rock is a fine to medium-grained granitic rock with a pinkish colour. Granophyres are microgranites which have a micrographic texture, distinguished mainly by their groundmass which consists of intergrown quartz and alkali feldspar. This graphic intergrowth is typified by fibres of quartz growing away at right angles to the faces of feldspar crystals, resulting in an appearance similar to hieroglyphs. British Geological Survey Petrology Collection sample number EMC1094. Hypersthene is a mineral of the orthopyroxene group. It is a common rock-forming mineral and an essential constituent of many igneous rocks such as gabbros and andesites. It is often distinguished by its distinctive bronze or greenish-brown coloured cleavage reflection. The granophyre forms part of the Tertiary igneous complex of Rum. The emplacement of the complex had two main stages: 1. The granophyre in the west and 2. The extensive ultrabasic rocks in eastern Rum. |
| Date taken: | 01/12/2002 |
| Photographer: | McTaggart, F.I. |
| Associate: | T.S. Bain |
| Copyright statement: | NERC |
| Additional information: | EMC1094 |
| Orientation: | Landscape |
| Size: | 287.39 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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