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Uploaded on:
11/03/2009 05:38:44
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P number: P521531
Caption: Mineral specimen of stilbite. Byshot, east end of Kilpatrick Hills, Dumbartonshire.
Description: The specimen consists mainly of large radiating crystals of reddish stilbite. This mineral is a hydrated calcium aluminium silicate. British Geological Survey Petrology Mineral Collection sample number 8775. Stilbite is well-known in Scotland where it has been recorded growing in cavities in volcanic rocks, such as in the basalts of the Isle of Skye. Stilbite belongs to the zeolite group of minerals and monoclinic crystal system. In characteristic reddish-brown colour this specimen shows the equally characteristic fibrous radiating habit. It has a hardness of 3.4 to 4, with a perfect cleavage and is transparent or translucent. It is formed as a late hydrothermal mineral in cavities in basaltic rocks often associated with calcite and other zeolites. This specimen is from the Kilpatrick Hills which are formed part of the Dinantian (Lower Carboniferous) Clyde Plateau Lavas, a thick sequence of basalts of various types. The Kilpatrick Hills and Skye are two well-known localities for stilbite. It is a mineral of interest to collectors and scientists and has no economic value.
Date taken: 01/01/2003
Photographer: Unknown
Copyright statement: NERC
Orientation: Portrait
Size: 180.72 KB; 775 x 1000 pixels; 66 x 85 mm (print at 300 DPI); 205 x 265 mm (screen at 96 DPI);
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Categories: Best of BGS Images/ Rocks and minerals  


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