| P number: | P526438 |
|---|---|
| Caption: | Photomicrograph of sandstone from Chollerford Quarry, Chollerford, Northumberland, England |
| Description: | The image is a photomicrograph of part of a thin section of Black Pasture sandstone viewed in order to show the grain structure of the rock. The specimen is of Carboniferous age. British Geological Survey Petrology Collection sample number MC 6187. The sample is a quartz-rich sandstone, with the quartz grains showing varying shades of grey (ranging from white to black). A single flake of muscovite white mica is present in the view, easily distinguished by its lath-like shape and its bright interference colours. Black Pasture stone is well known by stone masons for its durability because it is a relatively hard stone to cut and work. This is probably because of its relatively pure and quartz-rich nature, and the fact that the individual quartz grains are strongly cemented together by silica overgrowth. This can be seen in the thin section which shows that the grains are closely packed and in many cases appear to be intergrown. |
| Date taken: | Sun Jun 25 00:00:00 GMT 1905 |
| Photographer: | Unknown |
| Copyright statement: | Unknown |
| Orientation: | Landscape |
| Size: | 307.99 KB; 1000 x 667 pixels; 85 x 56 mm (print at 300 DPI); 265 x 176 mm (screen at 96 DPI); |
| Average Rating: | Not yet rated |
| Categories: | Unsorted Images |
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