| |
| | Vogue Gioiello - The international website for jewelry, goldsmith and watchmaking |
 | | Many minerals show chatoyancy, but the most typical example is the “tiger’s eye” quartz variety, where the phenomenon is caused by the parallel crocidolite fibres, a type of asbestos (an amphibole). |
 | | The most sought-after ‘cat’s-eye’ gem stone, however, is the “cymophane” variety of the chrysoberyl, but the cat’s-eye varieties of other minerals, such as tourmalines, beryls, diopsides, zircons, scapolites and, very rarely, corundums, are just as attractive. |
 | | The cat’s-eye effect is not exclusive to natural stones, as it can also be found in synthetic and artificial stones, such as synthetic alexandrites and a lot of imitation glass. |
| www.voguegioiello.net /01gio/0104/1301/02/eindex.shtml (308 words) |
|