| P number: | P528025 |
|---|---|
| Caption: | Photomicrograph of limestone and dolomite. Light: PPL. Magnification: x2.5. Old quarry, west bank of Allt Folais, 690 yards north of Letterewe House, Rossshire, Scotland. |
| Description: | Thinly and irregularly flaggy limestone with a reticulation of thin veins of calcite. This specimen is Lewisian (Precambrian) in age. BGS sample number SL 259. British Geological Survey Petrology Collection sample number S 35264. Photomicrograph details: Light: PPL, Magnification: x2.5. The thin section shows a rock in which angular grains of calcite about 0.05 to 0.3 mm across are scattered like sand grains in a very fine matrix of carbonate of grain size 0.01 mm. This is cut by thin veins containing calcite, quartz and barytes. The latter two minerals occur also in small aggregates throughout the rock. Phlogopite is present in flakes up to 0.5 mm long. A sericitic clay aggregate is also present. Some curious small spheroidal growths of calcite in the rock seem to be of the same age as the formation of phlogopite. When the sample was dissolved in cold hydrochloric acid, the residue contains barytes, quartz, phlogopite and dolomite in that order of abundance. |
| Date taken: | Sun Jun 25 00:00:00 GMT 1905 |
| Photographer: | Unknown |
| Copyright statement: | Unknown |
| Orientation: | Landscape |
| Size: | 359.27 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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