| P number: | P528142 |
|---|---|
| Caption: | Muscovite mica split, trimmed and graded as 'No. 5', 'dotted' from the Loch Nevis Mica Prospect, Knoydart, Invernessshire. |
| Description: | Three specimens of No. 5 'dotted' muscovite mica from the Loch Nevis Mica Prospect, Knoydart, Invernessshire and processed at the Pitlochry Sorting Factory. British Geological Survey Petrology Collection sample number MC 7750. No. 5 is one of the strategic grades that is in most demand and indicates the mica sheets are between 3 and 6 square inches. The value of mica was extremely high in proportion to its weight. The proportion of useable mica from a deposit is very small and does not normally exceed one or two per cent of the total quantity of rock excavated. Ninety-five per cent of sheet mica is graded No. 4 or under. |
| Date taken: | 25/06/1905 |
| Photographer: | Unknown |
| Copyright statement: | Unknown |
| Orientation: | Landscape |
| Size: | 193.48 KB; 1000 x 665 pixels; 85 x 56 mm (print at 300 DPI); 265 x 176 mm (screen at 96 DPI); |
| Average Rating: | Not yet rated |
| Categories: | Unsorted Images |
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