| P number: | P521379 |
|---|---|
| Caption: | Rock specimen of quartz-biotite 'hyperite'. Gairy, west of Tunskeen, 5 miles south-west of Loch Doon head, Ayrshire, Scotland. |
| Description: | The sample is an attractive coarse-grained crystalline igneous rock. It has a speckled colour with dark iron and magnesium-rich crystals of biotite within a pale groundmass of plagioclase feldspar and a small proportion of quartz. British Geological Survey Petrology Collection sample number EMC3167. The term hyperite is an obsolete name for a gabbro containing the pyroxene minerals hypersthene and augite. A gabbro is a coarse-grained (plutonic) basic igneous rock consisting of plagioclase feldspar, and pyroxene and commonly olivine. It may contain small amounts of hornblende, biotite, quartz and magnetite or ilmenite. The hyperite is associated with the Loch Doon Granite which has been dated at 408 Ma, Silurian 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: | EMC3167 |
| Orientation: | Landscape |
| Size: | 294.81 KB; 1000 x 739 pixels; 85 x 63 mm (print at 300 DPI); 265 x 196 mm (screen at 96 DPI); |
| Average Rating: | Not yet rated |
| Categories: | Unsorted Images |
Loading...
Loading...
Reviews
There is currently no feedback