| P number: | P528003 |
|---|---|
| Caption: | Photomicrograph of Tingwall Limestone. Light: XPL. Magnification: x2.5. One-third of a mile north of Scalloway, Shetland Isles, Scotland. |
| Description: | A grey crystalline limestone with occasional micaceous films and clots. This specimen is Shetland metamorphic in age. BGS sample number SL 185. British Geological Survey Petrology Collection sample number S 34948. Photomicrograph details: Light: XPL, Magnification: x2.5. The rock consists essentially of intricately sutured grains of calcite, about 0.5 mm across, together with about 25 per cent of quartz in grains which are usually distributed singly among the calcite but also form small aggregates with associated muscovite. Muscovite occurs also in irregular or streaky aggregates, some of which have associated red biotite and alkali-feldspar. A little dolomite is present in rhombs about 2 mm across. Pyrite, rutile and opaque mineral dust are common accessories, whilst tourmaline is scarce. In summary the sample is a dolomitic limestone containing quartz, muscovite, biotite and pyrite. It is medium-grained and foliated. |
| Date taken: | Sun Jun 25 00:00:00 GMT 1905 |
| Photographer: | Unknown |
| Copyright statement: | Unknown |
| Orientation: | Landscape |
| Size: | 364.73 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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