| P number: | P526409 |
|---|---|
| Caption: | Photomicrograph of sandstone from Neilston Parish Church, Barrhead, Paisley, Renfrewshire, Scotland |
| Description: | The image is a photomicrograph of part of a thin section of sandstone showing the pore structure of the rock. British Geological Survey Petrology Collection sample number ED 7625. The rock is a coarse-grained and gritty quartz-rich sandstone, with common polycrystalline grains. It has a grain size generally ranging between 0.5 and 0.8mm, with common grains as large as 1 to 1.8mm. The rock is not strongly compacted, with relatively thin quartz overgrowths resulting in an open porosity. Large areas of the porosity are infilled by clays; forming clusters of very fine-grained 'books' of clay with a very low birefringence. Some areas of clay are more crystalline and mica-like with a higher birefringence. Polycrystalline quartz grains contain a combination of quartz in various optical orientations within one grain. They are often thought to represent the result of erosion of a metamorphic source rock. |
| Date taken: | Sun Jun 25 00:00:00 GMT 1905 |
| Photographer: | Unknown |
| Copyright statement: | Unknown |
| Orientation: | Landscape |
| Size: | 311.95 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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