| P number: | P527941 |
|---|---|
| Caption: | Photomicrograph of limestone, Sandend Group. Light: XPL. Magnification: x2.5. Blackhillock Quarry, 1 rnile south of Coachford and about 5 miles north-west of Huntly, Aberdeenshire, Scotland. |
| Description: | Grey crystalline limestone with dark micaceous partings. This specimen is Dalradian Supergroup (Precambrian) in age. BGS sample number SL 71. British Geological Survey Petrology Collection sample number S 34511. Photomicrograph details: Light: XPL, Magnification: x2.5. The rock consists of twinned granular calcite in interdigitating grains of varying size, 0.1 to 2 mm, the larger being elongated along the schistosity. Quartz, muscovite and chlorite are subordinate, and opacite including pyrite, leucoxene and perhaps graphite, accessory. The quartz is distributed as individual grains and as lenticles, the other constituents usually in contorted films swelling in places to small nests. In summary the rock is a limestone with quartz, muscovite and chlorite. It is medium-grained, grano-schistose and foliated. |
| Date taken: | Sun Jun 25 00:00:00 GMT 1905 |
| Photographer: | Unknown |
| Copyright statement: | Unknown |
| Orientation: | Landscape |
| Size: | 326.18 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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