| P number: | P524305 |
|---|---|
| Caption: | Photomicrograph of beerbachite. Light: XPL, Magnification x 10. Glen Harris, Rum, Invernessshire. |
| Description: | The image is a photomicrograph taken under plane-polarized light, showing the birefringence colours of the different mineral constituents of the rock. The grains of probable pyroxene show bright interference colours, whilst the groundmass plagioclase shows typical low-order grey colours. Lamellar twinning can also be seen within the plagioclase crystals. British Geological Survey Petrology Collection sample number S 97004. Light: XPL, Magnification x 10. Light: XPL, Magnification x 10. A beerbachite is a dyke rock, chiefly composed of labradorite, orthopyroxene, clinopyroxene and magnetite, in a granular (granoblastic) texture. The island of Rum consists of a basement of Torridonian (Precambrian) grits and shales with a major Tertiary central intrusion complex. The complex developed in two main stages, the first dominated by acid magmatism and the intrusion of a granophyre and microgranite in western Rum as well as extrusive volcanism and ring faulting. The second stage involved the intrusion of the Rum layered ultrabasic complex for which Rum is famous. |
| Date taken: | 01/01/2003 |
| Photographer: | Hyslop, E.K. |
| Copyright statement: | NERC |
| X longitude/easting: | 137480 |
| Y latitude/northing: | 796420 |
| Coordinate reference system, ESPG code: | 27700 (OSGB 1936 / British National Grid) |
| Orientation: | Landscape |
| Size: | 259.37 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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