| P number: | P528137 |
|---|---|
| Caption: | Muscovite mica split, trimmed and graded as 'No. 5.5 ', '1st quality' from the Loch Nevis Mica Prospect, Knoydart, Invernessshire. |
| Description: | Many specimens of muscovite mica cut, trimmed and graded as grade 5.5 splittings of 1st quality from the Loch Nevis Mica Prospect, Knoydart, Invernessshire and processed at the Pitlochry Sorting Factory. Grade No. 5.5 refers to a surface area of 2.5-3 square inches. British Geological Survey Petrology Collection sample number MC 7745. The preparation for the market of sheet mica is a fairly simple but skilled operation and is carried out entirely by hand with a splitting knife. Three stages are involved, rough cobbing, splitting and trimming. These specimens are known as 'splittings', the mica sheets have been split by hand into thin films 0.001 to 0.002 inch thick for use in mica board or micanite, flexible mica sheet or mica tape. The splittings are cemented together with shellac and built into the micanite. |
| Date taken: | 25/06/1905 |
| Photographer: | Unknown |
| Copyright statement: | Unknown |
| Orientation: | Landscape |
| Size: | 334.89 KB; 1000 x 684 pixels; 85 x 58 mm (print at 300 DPI); 265 x 181 mm (screen at 96 DPI); |
| Average Rating: | Not yet rated |
| Categories: | Unsorted Images |
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