| P number: | P531426 |
|---|---|
| Caption: | Photomicrograph of calcareous tufa. Light: XPL. Magnification: x2.5. Roadside 680 yards south of Tornapress Bridge, Kishorn, Ross and Cromarty, Scotland. |
| Description: | A flesh-coloured, porous mass of tufa, composed of a turbid mass of very fine-grained calcium carbonate showing irregularly concentric growths from many centres. This specimen is Recent in age. BGS sample number SL 254. British Geological Survey Petrology Collection sample number S 35354. Photomicrograph details: Light: XPL, Magnification: x2.5. The thin section shows an open aggregate formed by concentric calcium carbonate growths, which is partly filled by a brownish, slightly ferruginous marl containing small organic debris and scarce grains of quartz and feldspar. Tests on the material give the ordinary refractive index for calcite. This rock is formed as a contemporary tufa deposit in a waterfall where a spring issues from an outcrop of Durness Limestone. The tufa is sufficient in amount and composition to be a useful source of lime for local use. |
| Date taken: | Sun Jun 25 00:00:00 GMT 1905 |
| Photographer: | Unknown |
| Copyright statement: | Unknown |
| Orientation: | Landscape |
| Size: | 373.65 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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