| P number: | P527964 |
|---|---|
| Caption: | Photomicrograph of Islay Limestone. Light: PPL. Magnification: x2.5. Lower Cragabus Quarry, two and a quarter miles west of Port Ellen, Islay, Argyllshire, Scotland. |
| Description: | Fine-grained, grey crystalline limestone. This specimen is Dalradian Supergroup (Precambrian) in age. BGS sample number SL 130. British Geological Survey Petrology Collection sample number S 34578. Photomicrograph details: Light: PPL, Magnification: x2.5. The sample is composed of granular calcite of irregular shape and size ranging from 0.01 to 0.4 mm and often with diffuse boundaries between neighbouring grains. Bedding is roughly marked by slightly greater and less concentration of opaque, black finely-divided material which is mainly soluble in strong hydrochloric acid and therefore must be largely iron oxides or sulphides. The insoluble residue consists mainly of quartz with an impregnation of black dust. In summary a fine-grained, grain-foliated limestone. |
| Date taken: | Sun Jun 25 00:00:00 GMT 1905 |
| Photographer: | Unknown |
| Copyright statement: | Unknown |
| Orientation: | Landscape |
| Size: | 375.58 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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