| P number: | P521364 |
|---|---|
| Caption: | Rock specimen of minette. Innerwell Point, south of Wigtown, Wigtownshire, Scotland. |
| Description: | The sample is a purplish-brown fine-grained basic igneous rock containing abundant large flakes of reflective white mica. British Geological Survey Petrology Collection sample number EMC3753. A minette is a term for a 'mica-trap' or more correctly a lamprophyre. These are dyke rocks which have a lustrous appearance due to the presence of abundant, well developed, dark mafic minerals such as biotite and amphibole. Lamprophyres typically contain large crystals (or phenocrysts) of mica, pyroxene, amphibole and olivine, within a fine-grained groundmass normally containing feldspar. The rock will be related to the Criffel Granite, Devonian 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: | EMC3753 |
| Orientation: | Landscape |
| Size: | 290.44 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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