| P number: | P528005 |
|---|---|
| Caption: | Photomicrograph of Tingwall Limestone. Light: PPL. Magnification: x2.5. Girlsta Quarry, near shore of Wadbister Voe, Shetland Isles, Scotland. |
| Description: | A pale grey, fine-grained crystalline limestone. This specimen is Shetland metamorphic in age. BGS sample number SL 187. British Geological Survey Petrology Collection sample number S 34951. Photomicrograph details: Light: PPL, Magnification: x2.5. The rock is composed of interlocking grains of calcite 0.5 mm across, which show glide twinning and a little peripheral granulation. Small patches of coarser-grained, clear calcite are present throughout. Quartz is abundant, about 5-10 per cent by volume, in small grains, and occurs also as larger grains in quartz-clinochlore aggregates. Muscovite is in places a subordinate mineral and elsewhere is only accessory. Pyrite is accessory. In summary, the sample is a limestone with quartz, chlorite and muscovite. It is medium-grained and granoblastic, with a moderate foliation. |
| Date taken: | Sun Jun 25 00:00:00 GMT 1905 |
| Photographer: | Unknown |
| Copyright statement: | Unknown |
| Orientation: | Landscape |
| Size: | 329.78 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 |
Loading...
Loading...
Reviews
There is currently no feedback