P527913

Uploaded on:
17/03/2009 05:37:07
Type:
Digital Asset
File Size:
162.06 KB
Dimensions:
1000 x 775 pixels
4139 views 4 downloads
P number: P527913
Caption: Aragonite on galena, South Glencrieff (New Glencrieff Mine), Wanlockhead, Dumfriesshire.
Description: A specimen of massive aragonite on galena from South Glencrieff, Wanlockhead, Dumfriessshire. Galena is the principal lead ore of the district and aragonite is a gangue mineral of no commercial value. British Geological Survey Petrology Collection sample number MC 7689. Galena is lead sulphide and belongs to the cubic crystal system. It is a soft mineral, only 2 to 2.5 on Moh's scale of hardness. It is very heavy with a specific gravity of 7.2 to 7.6. It is typically a mineral of medium-temperature hydrothermal deposits associated with sphalerite (zinc-blende). The aragonite is composed of calcium carbonate and belongs to the orthorhombic crystal system. It is closely related to calcite which has the same composition but belongs to the hexagonal crystal system. It is a high-pressure polymorph of calcite.
Date taken: 25/06/1905
Photographer: Unknown
Copyright statement: Unknown
Orientation: Landscape
Size: 162.06 KB; 1000 x 775 pixels; 85 x 66 mm (print at 300 DPI); 265 x 205 mm (screen at 96 DPI);
Average Rating: Not yet rated
Categories: Best of BGS Images/ Rocks and minerals  

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