| P number: | P527965 |
|---|---|
| Caption: | Photomicrograph of Islay Limestone. Light: PPL. Magnification: x2.5. In angle of main road and Persabus road, 2 mile west-south-west of Port Askaig, Argyllshire, Scotland. |
| Description: | Grey compact and crystalline banded limestone which seems to have a poor cleavage at a low angle to the banding. This specimen is Dalradian Supergroup (Precambrian) in age. BGS sample number SL 132. British Geological Survey Petrology Collection sample number S 34580. Photomicrograph details: Light: PPL, Magnification: x2.5. The rock contains numerous patches and wisps, often contorted but with a general parallel orientation, of dark, very fine-grained limestone in a recrystallized granular base of calcite, illustrating a palimpsest structure. The grain of the base is about 0.03-0.1 mm and small crystals of albite, about 0.1 mm across, are scattered through it. Small crystals and grains of pyrite appear in both the dark patches and the base. The term palimpsest is used to describe a texture in a metamorphic rock characterized by relics of a premetamorphic structure. |
| Date taken: | Sun Jun 25 00:00:00 GMT 1905 |
| Photographer: | Unknown |
| Copyright statement: | Unknown |
| Orientation: | Landscape |
| Size: | 344.49 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