Chatoyant Stones
The most commonly appreciated expression of the chatoyance phenomenon is in the formation of cat'seyes and stars.
Chatoyant
This term is applicable to a number of different stones, Tiger Eye is one example. A chatoyant gem exhibits a changeable silky luster as light is reflected within the thin, parallel, fibrous bands.
Chatoyant
The term chatoyant is used for those stones that have ability to display or reflect a cat's eye effect. This effect is caused by the precise occurrence of slight inclusions.
Chatoyant: A stone having a changeable luster due to the way it reflects light, such as the cat's-eye or tiger's eye gemstones. From the French "chatoyer", meaning to shimmer like cats' eyes, from the French "chat" meaning "cat".
Chatoyant: Chantoyancy is the effect in certain translucent stones when viewed in a suitable direction and light showing a streak of light in the interior that reflects across a curved surface as the position of the stone is changed.
A chatoyant variety of chrysoberyl is called "cymophane" or "Cat's eye," and is usually a translucent yellow. The name "cymophane" is derived from the Greek words "wave" and "appearance" (wavy appearance).
Cat's eye (chatoyant chrysoberyl) is a yellow to green-yellow to gray-green stone with a bright, pupil-like slit that seems to move slightly as the stone is moved. Most Cat's eye is cut as cabochons to maximize the distinctive pupil-like effect.
Colors: green/red (alexandrite), greenish or brownish yellow to translucent and chatoyant (cat eye) colorless to brown
Hardness: 8.5
Specific gravity: 3.71 - 3.73
Cleavage: distinct in two directions
Refractive index: avg. 1.75 v. .009 ...
Chatoyant is the ability to exhibit chatoyancy. chemical A substance with a distinct molecular formation, produced by a chemical process. chemical bond A force by which atoms are bound in a molecule or crystal.
High-quality rainbow moonstone is usually chatoyant and sometimes displays a strong cat's eye. The floating-light phenomenon and sheen of moonstone are called adularescence or schiller.
Gemstone Physical Composition: Tigerseye is a chatoyant stone made primarily of silicon dioxide (silica), and banded with parallel lines of golden-yellow, and dark yellowish-brown or reddish-brown.
Transparent stones of clean color have been faceted, and chatoyant specimens have been cabochon cut.
The stone is found in pale yellow, colorless, pink chatoyant and violet chatoyant. The pale yellow scapolite is acquired from Brazil and the chatoyant types are from Burma and Russia.
The best known variety of chatoyant quartz (or cat’s eye quartz), tiger’s eye is appropriately named.
Tiger's eye (also Tigers eye, Tiger eye) is a chatoyant gemstone that is usually gold- to red-brown, with silky lustrous alternating yellow or brown bands. Tiger's eye is displaying chatoyancy (a vertical luminescent band like that of a cat's eye).
Color: Gold-yellow, Gold-Brown, with chatoyant stripes
Hardness: 6.5 to 7
Transparency: Opaque
Can be found in South Africa, Australia, Burma, Namibia, the United States, and India ...
Tiger's Eye is a chatoyant gemstone that belongs in the quartz group. The stone is mined primarily in South Africa and Western Australia. Other countries where Tiger's Eye can be found are USA, Canada, Brazil, Namibia, China, India and Burma.
The color is blue/black and the mineral exhibits a chatoyant quality. It was discovered by Sid Pieters, Windhoek, Namibia, and is truly lovely.
There must be three or more chatoyant bands inside the gems to produce "asterism". The arrangement of needles in a hexagonal pattern produced six-rayed "asterism".
However, fine catseyes are obtained from the chatoyant fibrous material.
Tiger eye is best known for the strong
chatoyant effect it displays when properly cut.
This is caused by the inclusion of asbestos fibers
caught in the forming quartz mineral.
It is one of the chatoyant gemstones. Chatoyancy exhibits a changeable silky luster as light is reflected within the thin parallel fibrous bands. This effect is due to the fibrous structure of the material.
Tiger's eye is a type of chatoyant quartz with fibrous inclusions (especially crocidolite). This stone is sometimes heat-treated. Tiger's eye has a hardness of 7.0.
Perhaps the most prized of gemstones in either transparent faceted form or chatoyant star rubies. One of the prime sources is the Mogok area of Burma. Fine stones over 2 carats are rare and expensive.
Sapphire ...
Gemstones ruled by Ketu include Cat's eye chrysoberyl, beryl, apatite,tourmaline and other yellow to greenish-brown gems which display a strong chatoyant "cat's eye" light reflection on the surface and often within the crystal when cabochon cut.
Apatite: A form of calcium phosphate that is a clear to opaque and comes in many colors including green, yellow, blue, violet, and yellow-green (called asparagus stone). Some apatite stones are chatoyant, like the stone tiger's eye.
Paraíba- intense blue to green from Paraíba, Brazil, colored by copper
Cat's Eye - chatoyant tourmaline in a variety of colors
Color-Change - changes from green in daylight to red in incandescent light ...
Tiger's Eye: A semiprecious variety of quartz found in South Africa. It may be yellowish-brown, bluish, or red in color with bands of darker and lighter shades across its surface. It has a silky luster, and catches the light causing the chatoyant ...
Tiger's eye is usually highly polished and set as a cabochon (or cut as a bead) to display the stone's chatoyancy (light reflected in thin bands within the stone). Tiger's eye is a type of chatoyant quartz with fibrous inclusions (especially ...
"golden beryl", but it differs much from beryl both in chemical composition as in crystal structure. Chrysoberyl -as a gem - is yellow to green in color with a transparent varieties, namely the color changing alexandrite and cymophane (chatoyant ...
When used by itself, the term cat's eye always refers to the chatoyant variety of the mineral chrysoberyl. Any other gemstone exhibiting this optical property must have its name specified: quartz cat's eye, or cat's-eye quartz, for example.
they were merely polished and drilled as beads or notched to be suspended (as still done in India and the Near East). In the West the stone is usually step cut in rectangular shape; but some are cut en cabochon (especially those that are chatoyant) ...
Tigers Eye:A fibrous quartz with distinct chatoyant, or a slit of light resembling a cat's eye, when cut as a cabochon. A favorite gemstone for men, Tiger's Eye possesses a rich brown and yellow-gold color with a silky luster.
 See also: Color, Stone, Gemstone, Crystal, Mineral
  
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