In gemology, chatoyancy (i {respell|shə|TOY|ən-see}), or chatoyance or cat`s eye effect, is an optical reflectance effect seen in certain gemstones. Coined from the French `œil de chat,` meaning `cat`s eye,` chatoyancy arises either from the fibrous structure of a material, as in tiger`s eye quartz, or from fibrous inclusions or cavities...
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http://en.wikipedia.org/wiki/Chatoyancy
From the French words chat (cat) and oeil (eye) and describes the optical effect whereby a strip of light is reflected within the stone and glints back and forth, resembling the feline eye. It is most prominent in chrysoberyl , but is also found in a few other gemstones including tourmaline .
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http://www.braybrook.co.uk/jewellery-and-silver-wisdom/gems-of-information/
The appearance of well-defined bands or threads of lightacross the surface of a gemstone. This appearance is caused bythe reflection of light off small parallel mineral inclusions.May appear as a single-band chatoyancy--Cat's Eye--or a series ofbands--Tiger's Eye.
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http://www.encyclo.co.uk/local/22148
Phenomenon of certain cat's eye minerals which causes it to exhibit a concentrated narrow band of reflected light across the center of the mineral. Chatoyancy is usually only seen on polished cabochons. Chatoyant is the ability to exhibit chatoyancy.
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http://www.encyclo.co.uk/local/22290
Phenomenon of certain cat's eye minerals which causes it to exhibit a concentrated narrow band of reflected light across the center of the mineral. Chatoyancy is usually only seen on polished cabochons. Chatoyant is the ability to exhibit chatoyancy.
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http://www.encyclo.co.uk/local/22291
Light effect which resembles the slit-eye of a cat. Arises through reflection of the light from parallel fibres, needles and cavities.
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https://www.encyclo.co.uk/local/20501
No exact match found.
