| P number: | P521426 |
|---|---|
| Caption: | Rock specimen of Ross of Mull granite. Crags on east side of An Grosan, 0.5 miles south-west of Bendoran Cottage, Mull, Argyllshire, Scotland. |
| Description: | The sample is a coarse-grained crystalline intrusive igneous rock with distinctive large orange-pink crystals of alkali feldspar, abundant grey glassy-looking quartz and black biotite mica. British Geological Survey Petrology Collection sample number EMC4546. The Ross of Mull granite has been quarried and extensively used as a building stone, prized for its decorative appearance and structural strength. It outcrops over an area of 52 square kilometres on the westernmost tip of the island of Mull. The Ross of Mull granite has been dated by isotopic methods at around 420 million years old. It contains abundant inclusions of the surrounding Moine metasedimentary rocks, many of which are structurally little disturbed. However most have undergone considerable thermal alteration as a result of contact metamorphism, and some contain spectacular metamorphic minerals such as sillimanite. |
| Date taken: | Sun Dec 01 00:00:00 GMT 2002 |
| Photographer: | McTaggart, F.I. |
| Associate: | T.S. Bain |
| Copyright statement: | NERC |
| Additional information: | EMC4546 |
| Orientation: | Landscape |
| Size: | 263.61 KB; 1000 x 775 pixels; 85 x 66 mm (print at 300 DPI); 265 x 205 mm (screen at 96 DPI); |
| Average Rating: | Not yet rated |
| Categories: | Unsorted Images |
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