| P number: | P527926 |
|---|---|
| Caption: | Photomicrograph of Blair Atholl Limestone. Light: XPL. Magnification: x2.5. Quarry north of White Bridge, 3.5 miles south by east of Tummel Bridge, Perthshire, Scotland. |
| Description: | Bluish-grey schistose limestone of fine grain size with abundant quartz and mica. This specimen is Dalradian Supergroup (Precambrian) in age. BGS sample number SL 4. British Geological Survey Petrology Collection sample number S 34430. Photomicrograph details: Light: XPL, Magnification: x2.5. Schistosity is marked by the elongation of closely twinned calcite and the attitude of mica flakes, and quartz, alkali-feldspar and white mica are concentrated in lenticles parallel to this direction. The calcite grains reach 3 mm in length by 0.8 mm width. The feldspar is turbid and is probably albite. Some pyrite, a little sphene and apatite and possibly graphite are also present. A limestone recrystallized under stress. The calcite grains are elongated parallel to the plane of schistosity and the rock is granoschistose in structure. Small lenses of granular quartz define a foliation parallel to the schistosity produced by elongation of the calcite. |
| Date taken: | Sun Jun 25 00:00:00 GMT 1905 |
| Photographer: | Unknown |
| Copyright statement: | Unknown |
| Orientation: | Landscape |
| Size: | 373.54 KB; 1000 x 663 pixels; 85 x 56 mm (print at 300 DPI); 265 x 175 mm (screen at 96 DPI); |
| Average Rating: | Not yet rated |
| Categories: | Unsorted Images |
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