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P526990

Uploaded on:
14/03/2009 01:50:31
Type:
Digital Asset
File Size:
360.96 KB
Dimensions:
1000 x 667 pixels
66 views 4 downloads
P number: P526990
Caption: Photomicrograph of sandstone from Cullalo Quarry, Aberdour, Fifeshire, Scotland
Description: The image is part of a thin section taken using a relatively high-power lens in order to show the various mineral components and porosity details in the rock. The specimen is of Carboniferous age. British Geological Survey Petrology Collection sample number N 4176. The sandstone is dominated by clear grains of quartz and feldspar, with rare small specks of black carbonaceous debris. The presence of blue dyed resin in the thin section highlights the porosity. Cullalo sandstone was used to repair the High Kirk of St. Giles in Edinburgh between 1829 and 1833, where the greater part of the building (with the exception of the Medieval Tower and the 19th century additions) was encased in the stone. The fine-grained sandstone is mostly polished or lightly tooled and has a greyish colour and is slightly micaceous. A few stones exhibit cross-bedding, and on the whole the stone has weathered well, with only a few, rare ironstone concretions which are weathering out.
Date taken: 25/06/1905
Photographer: Unknown
Copyright statement: Unknown
Orientation: Landscape
Size: 360.96 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
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