| P number: | P552836 |
|---|---|
| Caption: | Dolomite. Field about 350 yards south-south-west of Sarsgrum, about 50 yards east of the road. Sutherland. |
| Description: | The analyses were made on composite samples, the most prominent components of which are represented by the specimens described below; but the proportions of the various types may have differed somewhat in the samples supplied for Anal. M23800 and Anal. GS 1202, respectively. S 34838. Crystalline dolomite of grain-size varying from 0.2-0.6 mm and of a slightly brown colour in transmitted light. The grains are interlocking and mostly of irregular shape but a proportion of them show rhomboid outlines. Ferruginous clay locally forms impersistent, intergranular films. Dolomite, medium-grained, mosaic. S 34839. A line granular dolomite showing non-uniform distribution of grain-size. The slide includes parts with grain of about 0-1 mm, irregularly and transitionally mixed with coarser grained dolomite of about 0.4 mm grain-size. Ferruginous material is present in very small quantity as short films and intergranular pellicles. Dolomite, varigrained, breccioid, mosaic. S 34840. Dolomite of grain-size about 0.3 mm traversed by a diffuse network of coarser grained dolomite (0.6 - 1.5mm). All of it has a brownish tint. A little chert is present in thin veins which seem to replace the dolomite, pices of which are left optically continuous on the opposite side of veins. Some granular quartz and ferruginous matter are also present. Dolomite Medium grained, breccioid, mosaic. S34841 . Dolomite of uniform grain size, 0.5 - 1.0mm. The grains are equidimensional and anhedral, no rhomboid outlines having been observed. Limonite is present in small quantity as granules and intergranular films. Dolomite, medium-grained, mosaic. SL0176. Britrocks S34838. Magnification x40. Light PPL. |
| Date taken: | Wed Jan 21 00:00:00 GMT 2004 |
| Photographer: | Sutherland, A. |
| Copyright statement: | NERC |
| Additional information: | Description from: Limestones of Scotland: chemical analyses and petrography. Edinburgh : HMSO, 1956. 10 minutes in Logwood stain. |
| Orientation: | Landscape |
| Size: | 287.48 KB; 1000 x 750 pixels; 85 x 64 mm (print at 300 DPI); 265 x 198 mm (screen at 96 DPI); |
| Average Rating: | Not yet rated |
| Categories: | Unsorted Images |
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