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16/03/2009 10:01:55
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P number: P527691
Caption: A specimen of Cambrian Pipe rock from south-west of Achnashellach, Strathcarron, Ross and Cromarty.
Description: Lying stratigraphically above the nearby Cambrian Basal Quartzite is the Pipe rock. The rock is composed essentially of quartz grains which are commonly elongated with their long axes sub-parallel. British Geological Survey Petrology Collection sample number MC 7468. The quartz grains range in length up to 2 mm. and are strained. Under a microscope quartz grains from the Pipe rock from this locality have fluid inclusions which in some cases stop at grain boundaries and in others traverse the grain boundaries without deflection. Both the Pipe rock and the Basal Quartzite were investigated as a source for high grade silica during World War Two. Samples were taken for bulk analysis and the results were written up in the Geological Survey of Great Britain Wartime Pamphlet No. 7.
Date taken: 25/06/1905
Photographer: Unknown
Copyright statement: Unknown
Orientation: Landscape
Size: 172.84 KB; 1000 x 665 pixels; 85 x 56 mm (print at 300 DPI); 265 x 176 mm (screen at 96 DPI);
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