| P number: | P528004 |
|---|---|
| Caption: | Photomicrograph of Tingwall Limestone. Light: XPL. Magnification: x2.5. Quarry, east side of road 1 mile north-north-east of Scalloway, Shetland Isles, Scotland. |
| Description: | A grey crystalline limestone with a lamination in shades of grey, which is flaggy and laminated in places. This specimen is Shetland metamorphic in age. BGS sample number SL 186. British Geological Survey Petrology Collection sample number S 34949. Photomicrograph details: Light: XPL, Magnification: x2.5. The rock is composed of anhedral interlocking grains of twinned calcite, with thin laminae of muscovite, or muscovite-graphite-schist. These laminae have been cut into schlieren by the flowage of calcite and show internal schistosity differing in direction from the parallel arrangement of the schlieren. Quartz is sparsely distributed among the calcite and graphite is disseminated on the grain surfaces in the calcite bands. Pyrite is accessory; apatite scarce. In summary, the rock is a limestone with graphite, quartz and pyrite. It is fine-grained, with a sheared texture. |
| Date taken: | Sun Jun 25 00:00:00 GMT 1905 |
| Photographer: | Unknown |
| Copyright statement: | Unknown |
| Orientation: | Landscape |
| Size: | 345.32 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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