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In gemology, chatoyancy (or chatoyance) is an optical reflectance effect seen in certain gemstones. Coined from the French, meaning "cat's eye," chatoyancy arises either from the fibrous structure of a material, as in tiger eye quartz, or from fibrous inclusions or cavities within the stone, as in cat's eye chrysoberyl. The effect can be likened to the sheen off a spool of silk; the mobile, wavering reflection always being perpendicular to the direction of the fibres. For a gemstone to show this effect it must be cut en cabochon, with the fibers or fibrous structures parallel to the base of the finished stone. Tigers eye cabochon gem. ...
Tigers eye cabochon gem. ...
Gemology (gemmology outside the United States) is the science, art and profession of identifying and evaluating gemstones. ...
Table of Opticks, 1728 Cyclopaedia Optics ( appearance or look in ancient Greek) is a branch of physics that describes the behavior and properties of light and the interaction of light with matter. ...
A selection of gemstone pebbles made by tumbling rough rock with abrasive grit, in a rotating drum. ...
Polished tigers eye gemstone Polished tigers eye gemstone Tigers eye (also Tigers eye, Tiger eye) is a chatoyant gemstone that is usually yellow- to red-brown, with a silky luster. ...
Quartz is one of the most common minerals in the Earths continental crust. ...
The mineral or gemstone chrysoberyl, not to be confused with beryl, is an aluminate of beryllium with the formula BeAl2O4. ...
A cabochon or cabouchon is a gemstone which has been shaped and polished as opposed to facetted. ...
Some gem species known for this phenomenon include the aforementioned quartz, chrysoberyl, beryl (especially var. aquamarine), tourmaline, apatite, moonstone and scapolite. Quartz is one of the most common minerals in the Earths continental crust. ...
The mineral or gemstone chrysoberyl, not to be confused with beryl, is an aluminate of beryllium with the formula BeAl2O4. ...
For other uses, see Beryl (disambiguation). ...
Aquamarine Aquamarine (Lat. ...
The tourmaline mineral group is chemically one of the most complicated groups of silicate minerals. ...
ske| Fracture|| Conchoidal to even Apatite is a group of phosphate minerals, usually referring to hydroxylapatite, fluorapatite, and chlorapatite, named for high concentrations of OH-, F-, or Cl- ions, respectively, in the crystal. ...
Insert non-formatted text hereMoonstone may refer to: go dawgs!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! #1 #1 #1 #1 #1!!!!!!!!!!!!!!!!!!!!! Moonstone, a type of gemstone (see orthoclase) The Moonstone, a novel by Wilkie Collins Moonstone Books, a publisher of graphic novels and comic books. ...
Scapolite (Gr. ...
Chatoyancy can also be used to refer to a similar effect in woodworking, where certain finishes will cause the wood grain to achieve a striking three-dimensional appearance. Artists can use woodworking to create delicate sculptures. ...
Wood grain describes the alignment, texture and appearance of the wood fibres. ...
See also
Asterism on the surface of a sapphire In gemmology, an asterism is an optical phenomenon displayed by some rubies, sapphires, and other gems of an enhanced reflective area in the shape of a star on the surface of a cabochon cut from the stone. ...
An optical phenomenon is any observable event which results from the interaction of light and matter. ...
References - Webster, R., Jobbins, E. A. (Ed.). (1998). Gemmologist's compendium. St Edmundsbury Press Ltd, Bury St Edwards.
External link - http://www.yourgemologist.com/chatoyancy.html
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