| P number: | P521333 |
|---|---|
| Caption: | Rock specimen of granite. Fasney Water, Priestlaw, 10 miles south-east of Haddington, Haddingtonshire, Scotland. |
| Description: | The sample is a uniform granite dominated by pinkish alkali feldspar, grey-coloured quartz and black biotite, with small dark patches throughout probably corresponding to iron oxide ore minerals. The rock has a uniform, granular texture and a fresh 'red' colour. British Geological Survey Petrology Collection sample number EMC2389. Granite is one of the most common and important rock types on the Earth. Scotland is well represented in granites with some particularly well known intrusions such as in Galloway, Arran, Rannoch Moor, Cairngorm, Lochnagar and the Ross of Mull. The granites of Aberdeenshire are particularly well known and have been prized for centuries as an ornamental building stone also renowned for its great strength. During late Silurian and possibly early Lower Devonian times minor resurgences of the Caledonian Orogeny occurred and they were accompanied by the intrusion into Lower Palaeozoic strata of dykes of quartz-porphyry, acid porphyrite and porphyrite, and less commonly plagiophyre, microgranodiorite and lamprophyre. The Priestlaw and Cockburn Law plutons were also emplaced during this Period . The rock of the Priestlaw intrusion has been identified as a biotite- or hornblende-biotite-granodiorite and the grain size increases from the periphery to the centre of the intrusion. |
| Date taken: | Sun Dec 01 00:00:00 GMT 2002 |
| Photographer: | McTaggart, F.I. |
| Associate: | T.S. Bain |
| Copyright statement: | NERC |
| Additional information: | EMC2389 |
| Orientation: | Landscape |
| Size: | 280.35 KB; 1000 x 723 pixels; 85 x 61 mm (print at 300 DPI); 265 x 191 mm (screen at 96 DPI); |
| Average Rating: | Not yet rated |
| Categories: | Unsorted Images |
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