| P number: | P527966 |
|---|---|
| Caption: | Photomicrograph of Tayvallich Limestone. Light: XPL. Magnification: x2.5. Cairnban Locks, Crinan Canal, Argyllshire, Scotland. |
| Description: | Moderately coarse, pale grey, crystalline, gritty limestone, abundantly speckled with dark vitreous quartz grains. This specimen is Dalradian Supergroup (Precambrian) in age. BGS sample number SL 133. British Geological Survey Petrology Collection sample number S 34581. Photomicrograph details: Light: XPL, Magnification: x2.5. The sample contains granular calcite forming a schistose matrix to numerous quartz and feldspar pebbles. Schistosity is marked by elongation of many calcite grains (up to 0.5 mm in length) and by streaks of dark matter, possibly carbonaceous. The pebbles include quartz, strained quartzite or composite quartz-blebs from granite, microcline, albite, perthite, and micro-pegmatite from granophyre. The quartz shows marginal granulitization and the margins, where not granulitized, are intercrystallized with the calcite. Much granulitic quartz among the calcite is evidently a crystallization of the same period as the latter. An albite pebble shows marginal regrowth. A little white mica is associated with feldspar. |
| Date taken: | Sun Jun 25 00:00:00 GMT 1905 |
| Photographer: | Unknown |
| Copyright statement: | Unknown |
| Orientation: | Landscape |
| Size: | 327.96 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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