| P number: | P528138 |
|---|---|
| Caption: | Muscovite mica from the Braetollie mica prospect, Alness, Rossshire. |
| Description: | The Braetollie mica prospect is in the valley of the Tollie Burn approximately 1400 yards north by west of Braetollie Farm, about 5.5 miles north-west of Alness Station. These specimens have been split and trimmed at the Pitlochry Sorting Factory. British Geological Survey Petrology Collection sample number MC 7746. The mica occurs in four or five thin lenticular sheet-like bodies of pegmatite 20 to 50 yards apart which are enclosed in Moine pelitic schists. The pegmatites do not exceed a few feet in thickness and are concordant with the host rock. The pegmatite consists mainly of quartz and mica with subordinate white feldspar; tourmaline and garnet are also present. The mica is a clear ruby muscovite forming books up to ten inches in diameter and three inches in thickness. The books are generally flat and well spaced. |
| Date taken: | 25/06/1905 |
| Photographer: | Unknown |
| Copyright statement: | Unknown |
| Orientation: | Landscape |
| Size: | 278.47 KB; 1001 x 686 pixels; 85 x 58 mm (print at 300 DPI); 265 x 182 mm (screen at 96 DPI); |
| Average Rating: | Not yet rated |
| Categories: | Unsorted Images |
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