| P number: | P521303 |
|---|---|
| Caption: | Rock specimen of marble. Iona, Argyllshire, Scotland. |
| Description: | The photograph is of a polished cut surface of Iona marble, showing variable yellow-cream coloured patches within a darker green matrix. The mineralogy of marble can be complex, but is typically dominated by calcite or dolomite (calcium and magnesium carbonate minerals) and 'calc-silicate' minerals such as forsterite and tremolite. The green areas are dominated by serpentine. British Geological Survey Petrology Collection sample number EMC762. The Iona Marble quarry has a very long history. It may have been worked as early as 1745 by the Earl of Breadalbane when he founded the Marble and Slate Company of Netherlorn. The Statistical Account of Scotland in 1795 states that marble quarrying by the Duke of Argyll had resulted in considerable quantities being sent to Leith and London. The quarry was used intermittently over the centuries, the last major period of extraction occurring just before the First World War. Iona marble is Lewisian (Precambrian) in age. The island consists of biotite-hornblende gneiss with some interleaved metasediments. The latter include garnet-mica-schists, psammites and the marble. The marble forms a narrow band 6-8 metres thick in the south of the island. It is white with a green serpentinous mottle. |
| Date taken: | Sun Dec 01 00:00:00 GMT 2002 |
| Photographer: | McTaggart, F.I. |
| Associate: | T.S. Bain |
| Copyright statement: | NERC |
| Additional information: | EMC762 |
| Orientation: | Landscape |
| Size: | 141.29 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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