| P number: | P528030 |
|---|---|
| Caption: | Photomicrograph of limestone, Portsoy Group. Light: XPL. Magnification: x2.5. Broadland Quarry, between Drumdelgie and Broadland, 3.25 miles west-north-west of Huntly, Aberdeenshire, Scotland. |
| Description: | Dark grey crystalline limestone, composed of calcite of varying grain size, ranging from 3.0-0.5 mm across, and elongated in the foliation planes. This specimen is Dalradian Supergroup (Precambrian) in age. BGS sample number SL 240. British Geological Survey Petrology Collection sample number S 35273. Photomicrograph details: Light: XPL, Magnification: x2.5. The rock has a rather intricate interlocking texture between the calcite grains and between calcite and quartz. Quartz is present in subordinate amounts (fully 5 per cent by eye estimation), and occurs as grains ranging from 0.5 to fully 2.0 mm in length. The large grains are intergrown with calcite. Phlogopite and opaque grains, which include pyrite, are abundant accessories. In summary, the rock is a limestone with quartz. It is coarse- to medium-grained, with a granoschistose and grain-foliated texture. |
| Date taken: | Sun Jun 25 00:00:00 GMT 1905 |
| Photographer: | Unknown |
| Copyright statement: | Unknown |
| Orientation: | Landscape |
| Size: | 308.47 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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