File:P527599.jpg
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Summary
| description | {{|1=This specimen of mica (showing lattice distortions) is from the quartz-mica pegmatite on Sgurr Coire nan Gobhar in Knoydart situated about 1.5 miles north-north-west of Kylesknoydart and 300 yards south-east from Loch Coir an Lochan, at an altitude of 1700-1800 feet. British Geological Survey Petrology Collection sample number MC 7379. The quarry was opened up in May 1943, at first working the original pegmatite discovered by the Geological Survey but later four other quarries opened up in the vicinity. During the life of the operations the original quarry remained the most important, supplying almost 70 of the total production. The mica zone in the pegmatite was about one metre wide and was proved for a length of about 80 metres. The muscovite mica sent for processing was of a high quality, it was brownish ruby in colour, hard, substantially flat and glossy. A small proportion had light vegetable staining and mineral dots. Overall, the mica from this deposit was graded as `stained? or better. The mica `books? were normally between seven and eight inches in diameter; books ranging up to 20 inches to two feet were not uncommon. They were about one inch thick.P527599.}} |
| source | British Geological Survey |
| author | British Geological Survey |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 18:04, 2 August 2017 | | 999 × 664 (342 KB) | Scotfot (talk | contribs) | User created page with UploadWizard |
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