| P number: | P519598 |
|---|---|
| Caption: | Specimen of roofing slate from Aberfoyle Slate Quarries, Perthshire, Scotland |
| Description: | Distinctive banded slate with alternating purple and greenish grey colours, termed 'tartan variety'. The specimen is of Precambrian, Dalradian age. British Geological Survey Petrology Collection sample number EMC 5773. The different colours are caused by from the presence of alternating sedimentary beds which have slightly different compositions. During metamorphism, this results in the formation of different types of iron oxide minerals within different beds, some having a purple-red colour, whilst others are grey. The Aberfoyle tartan slate may have been used as a marketing feature for Scottish slate, but it is not known how commonly it was actually used as a roofing material. |
| Date taken: | Wed Jan 01 00:00:00 GMT 2003 |
| Photographer: | Bain, T.S. |
| Copyright statement: | NERC |
| Orientation: | Portrait |
| Size: | 140.87 KB; 775 x 1000 pixels; 66 x 85 mm (print at 300 DPI); 205 x 265 mm (screen at 96 DPI); |
| Average Rating: | Not yet rated |
| Categories: | Unsorted Images |
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