| P number: | P521527 |
|---|---|
| Caption: | Mineral specimen of pectolite. Castle Hill, 3.2 km west-south-west of Kilbirnie, Ayrshire. |
| Description: | The specimen consists of a series of radiating white fibres of the mineral pectolite. British Geological Survey Petrology Collection sample number E 3311A. Pectolite belongs to a group of minerals known as the pyroxenoids. These have a similar chemical composition to the pyroxene group of minerals, but are different in structure. They form as a result of hydrothermal metasomatic processes or metamorphism. Pectolite is a hydrous sodium calcium silicate belonging to the triclinic crystal system and usually occurs as colourless acicular crystals or as fibrous radiating spherical aggregates of a white or grey colour. It sometimes occurs as compact masses. It is formed by hydrothermal processes filling cavities in basalts and is commonly associated with zeolites, prehnite and calcite. Pectolite is of interest to collectors and has no industrial uses. The specimen was presented by John Smith, the author of the book 'Semi-precious stones of Carrick' (1910). |
| Date taken: | Wed Jan 01 00:00:00 GMT 2003 |
| Photographer: | Unknown |
| Copyright statement: | NERC |
| Orientation: | Landscape |
| Size: | 126.14 KB; 1000 x 679 pixels; 85 x 57 mm (print at 300 DPI); 265 x 180 mm (screen at 96 DPI); |
| Average Rating: | Not yet rated |
| Categories: | Unsorted Images |
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