Uploaded on:
16/03/2009 11:14:43
Type:
Digital Asset
File Size:
296.95 KB
Dimensions:
1000 x 665 pixels
259 views 4 downloads
P number: P527728
Caption: Dolomite from Keodale, Durness, Sutherland.
Description: A specimen of dolomite from Keodale, Durness, Sutherland. Dolomite is a magnesium carbonate rock. British Geological Survey Petrology Collection sample number MC 7505. The Durness Limestone ranges from pure limestone to pure dolomite. When analysed the limestones never contained more than 16 per cent magnesium carbonate while the dolomites never contained less than 41 per cent magnesium carbonate. There are no rocks with magnesium carbonate between these figures. A fairly quick way of separating out the dolomites from the limestone was to use Specific Gravity (SG). The SG of high-grade dolomite is greater than 2.82 while the SG of Limestone with up to 16 per cent magnesium carbonate is less than 2.75. Rocks between these ranges were dolomites with equi-molecular magnesium-calcium carbonate with over 10 per cent impurities.
Date taken: 25/06/1905
Photographer: Unknown
Copyright statement: Unknown
Orientation: Landscape
Size: 296.95 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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