| P number: | P530880 |
|---|---|
| Caption: | Detail of wall outside St. Mary's Cathedral, Leith Street, Edinburgh, Lothian Region. |
| Description: | The image shows the base of a retaining wall which is clad in a pale yellow-buff sandstone. The stone has a series of dark markings along its base and a variable white staining or 'bloom' caused by salt crystallization. Salt damage is one of the principle causes of building stone decay in sandstones; the force of the expanding salt crystals exerting great pressure within the pore spaces in the rock resulting in disaggregation of the original sand grains. Sandstones are bound together by a natural matrix cement which is composed of several mineral types such as silica, calcite and iron oxide. |
| Date taken: | Sun Jun 25 00:00:00 GMT 1905 |
| Photographer: | Unknown |
| Copyright statement: | Unknown |
| Orientation: | Landscape |
| Size: | 202.62 KB; 1000 x 659 pixels; 85 x 56 mm (print at 300 DPI); 265 x 174 mm (screen at 96 DPI); |
| Average Rating: | Not yet rated |
| Categories: | Best of BGS Images/ Stone and the built heritage (Building Britain) |
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