| P number: | P524425 |
|---|---|
| Caption: | Photomicrograph of mugearitic lava. Light: PPL, Magnification x 2. South-east slope of Dunsapie Hill, Edinburgh. |
| Description: | The image is a thin section photomicrograph of a basaltic rock. It consists of large crystals or phenocrysts of plagioclase feldspar, within a very fine-grained groundmass dominated by small feldspar laths and opaque oxide minerals. British Geological Survey Petrology Collection sample number ED 283. Light: PPL, Magnification x 2. Light: PPL, Magnification x 2. A mugearite is a volcanic rock that is an alkali basalt consisting of oligoclase plagioclase with subordinate alkali feldspar, and mafic minerals. In many examples olivine is more abundant than pyroxene. The term was proposed by the famous British geologist Alfred Harker in 1904, and is named after the village of Mugeary on the Isle of Skye. Dunsapie-type basalts are one of a number of distinctive basic lavas from the Central Belt of Scotland, such as Markle-type, Craiglockhart-type and Dunsapie-type. These are distinguished as being megaphyric basalts which have prominent plagioclase phenocrysts, pyroxene and olivine phenocrysts and phenocrysts of all three minerals, respectively. |
| Date taken: | Wed Jan 01 00:00:00 GMT 2003 |
| Photographer: | Hyslop, E.K. |
| Copyright statement: | NERC |
| Orientation: | Landscape |
| Size: | 396.95 KB; 1000 x 667 pixels; 85 x 56 mm (print at 300 DPI); 265 x 176 mm (screen at 96 DPI); |
| Average Rating: | Not yet rated |
| Categories: | Unsorted Images |
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