| P number: | P531446 |
|---|---|
| Caption: | Photomicrograph of limestone. Light: PPL. Magnification: x2.5. Quarry, 1450 yards south by west of Achvarasdal, Reay, Caithness, Scotland |
| Description: | A pale buff, compact limestone, composed essentially of rather turbid calcite with grain size 0.01-0.15 mm across, with scattered larger grains. This specimen is Middle Old Red Sandstone (Devonian) in age. BGS Sample Number SL 282. British Geological Survey Petrology Collection sample number S 35911. Angular quartz, up to 0.15 mm grain size, white mica, in flakes generally 0.1 mm long, and potash-feldspar are abundantly distributed in the rock and are concentrated along thin laminae coloured dark by bituminous matter. Following dissolution of the sample in cold dilute hydrochloric acid, the insoluble residue contains chlorite, hornblende and clay found as accessory constituents, and potash-feldspar which has developed crystal faces during recrystallisation. In summary the rock is a fine-grained muddy and bituminous limestone with strong bedding lamination. |
| Date taken: | 25/06/1905 |
| Photographer: | Unknown |
| Copyright statement: | Unknown |
| Orientation: | Landscape |
| Size: | 375.30 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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