Chatoyancy - Factbites

Chatoyancy - Factbites
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Topic: Chatoyancy

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	Chatoyancy - Wikipedia, the free encyclopedia
		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.
		In gemology, chatoyancy is an optical reflectance effect seen in certain gemstones.
		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.
	en.wikipedia.org /wiki/Chatoyancy (142 words)

	Structure of tiger eye reevaluated after 125 years
		Chatoyancy is a band or star of reflected light or color that moves through a gem depending on its orientation.
		Because crocidolite, and not quartz, is the cause of the shimmer in the tiger's eye, the variable chatoyancy that is tiger's eye's signature actually is a record of the structural path of the parent rock during tectonic events, says Heaney.
		Originally, tiger's eye's chatoyancy was attributed to chalcedony — a fibrous form of quartz— replacing fibrous crocidolite.
	www.eurekalert.org /pub_releases/2003-04/ps-sot032803.php (668 words)

	Light - Color Effects in Gemstones - Asterism - Chatoyancy - Silk
		Chatoyancy is a result of tiny fibers, or needles, naturally arranged in a parallel configuration.
		Chatoyancy is an effect resembling a slit of cat's eye.
		Light - Color Effects in Gemstones- Asterism- Chatoyancy - Silk
	www.asia-gems.com /gemology/light-color-effects.htm (485 words)

	Lanka Jewels - Gemstones - Gems of Lanka - Cat's Eye
		Chatoyancy caused by the reflection of light off minute, parallel, needle-like rutile crystals or hollow tubes.
		The chrysoberyl cat’s-eye is one of the most beautiful gemstones because of the “chatoyancy” or the eye effect.
		When a gem specimen exhibits both chatoyancy and change of colour, one or both phenomena will suffer.
	www.lankajewels.com /gems/gemstones/stones/05catseye.htm (383 words)

	Science News: Eye of the tiger: discovery about gem's structure overturns old theory - research indicates tiger's-eye chatoyancy arises from crocidolite fibers
		Because in those instances, the reflected cat's-eye bands of light were perpendicular to the crocidolite fibers, the scientists conclude that in tiger's-eye the chatoyancy arises from the crocidolite fibers, not the quartz.
		Chatoyancy occurs when light reflects from minute, parallel ridges, fibers, or tubes within a transparent material.
		This effect, called chatoyancy, gets its name from the French phrase for "cat's eye" because of its resemblance to a feline's slitted pupil.
	www.findarticles.com /p/articles/mi_m1200/is_17_163/ai_101339496 (883 words)

	Larry Coffin Artist Statement - Free Artist Portfolio at absolutearts.com
		Chatoyancy is that phenomenon of shimmering light you see when you look at a “cats-eye” gemstone and the light is reflected in such a way as to simultaneously jump out and retreat, causing the illusion of shimmering depth.
		The constantly changing light play of the chatoyancy always produces various figures as viewed from different angles.
		I am experimenting with enhancing a prominent figure and drawing your eye to that figure even as it appears and disappears from different angles.
	www.absolutearts.com /portfolios/l/larrycoffin/artist_statement.html (209 words)

	Hawk's Eye
		Chatoyancy is a silky, shimmering reflection, and in Hawk's Eye it is an optical effect caused when light hits the fine layers of replacement Quartz grains.
		A dictionary definition of chatoyancy is: "A polished surface that when turned towards the light often shows a series of lustrous bands alternating with bands of duller colour which show little silkly lustre.
		The Crocidolite surrounding the asbestos is not changed during the process, but the reflective properties of the layers of Quartz cause the stone to become chatoyant.
	www.snazzdragon.com /caz/hawk.html (751 words)

	Untitled
		Chatoyancy (cat's-eyes) and asterism (star-stones) are special reflections of light that add to the beauty and pleasure of the gemstones we prize.
		Chatoyancy, which comes from the French words for cat and eye, is a band of light across a gemstone.
		The inclusions that typically cause chatoyancy are tiny, needle-shaped crystals of rutile.
	www.suite101.com /print_article.cfm/2006/28726. (729 words)

	JADE Spheres: The mineralminers.com Virtual Gallery
		Its color is a medium-dark mottled green (100% natural color) with a bright silvery-green chatoyancy or cat's-eye visible on different areas of the sphere's surface (the cat's-eye is relatively broad and diffuse, and it is not easily visible in the photo at left).
		Its color is a medium-dark mottled green (100% natural color) with a silvery-green chatoyancy or cat's-eye visible on different areas of the sphere's surface (the cat's-eye is relatively broad and diffuse, and is not easily visible in the photo at left).
		Its color is a medium-dark mottled green (100% natural color) with a bright silvery-green chatoyancy or cat's-eye visible on different areas of the sphere's surface (the cat's-eye is relatively broad and diffuse, and is not easily visible in the photo at left).
	www.mineralminers.com /html/jadsphs.stm (1500 words)

	Gemsbrokers - Cat's eye
		Chatoyancy may occur in any color of the chrysoberyl but the most highly prized is the slightly greenish yellow or brownish yellow, a color similar to honey.
		The variety of chrysoberyl containing rutile needles or negative crystals oriented in the same direction showing some exceptional and sharp chatoyancy is called cat's-eye.
		The other factor affecting the value of the stone is the strength and sharpness of the eye.
	www.gemsbrokers.org /english/cats_eye/myths.htm (195 words)

	Chrysoberyl - Wikipedia, the free encyclopedia
		In this variety, microscopic tubelike cavities or needlelike inclusions of rutile occur in an orientation parallel to the c-axis producing a chatoyant effect visible as a single ray of light passing across the crystal.
		Translucent yellowish chatoyant chyroberyl is called cymophane or cat's eye.
		This effect is best seen in gemstones cut in cabochon form perpendicular to the c-axis.
	www.wikipedia.org /wiki/Chrysoberyl (602 words)

	Cat's Eye the Gemstone (Catseye)
		Chatoyancy or chatoyance, literally from French means cat's eye.
		Other stones which show chatoyancy include sapphire and tourmaline.
		The effect is a strongly banded one caused by tube-like or needle-like crystals running along the length of the stone.
	www.24carat.co.uk /catseye.html (140 words)

	[Ganoksin] [Gemstones] - A Second Look at Tiger's Eye - Colored Stone
		Chatoyancy refers to the reflection of light from bands of parallel fibers, which often impart a silky appearance to a mineral.
		They found that the chatoyancy is not dependent on the quartz pseudomorphs at all, but rather on microscopic fibers of crocidolite encapsulated within the quartz.
		They discovered that embedded within the rippling chatoyancy lies a record of the tectonic movements that shaped the Earth.
	www.ganoksin.com /borisat/nenam/tiger-eye.htm (894 words)

	The Eclectic Lapidary - Sphere of the Month: Spheres with Unusual Optical Phenomena
		Chatoyancy is the unique optical characteristics which are caused by the reflection of light along parallel fibers.
		Chatoyancy is a term unknown to many, even to some mineral enthusiasts.
		It is the play of light across a surface caused by the fibrous materials which are compacted together in tight bundles.
	www.bovagems.com /eclectic/HTML/19980901_9809SPHERE.html (784 words)

	Chatoyancy sapphire, NEED HELP!!!
		Chatoyancy in ruby and sapphire is very rare, I've myself seen only once a bluish sapphire from Burma showing this effect but it was weak and not sharp and the stone was quite ugly.
		It was confirmed by him that it was in fact a sapphire with a strong chatoyancy.
		Given a sapphire with many planes of inclusions lying along the basal plane, it is possible to get a chatoyancy of sorts by cutting the base parallel to the c-axis.
	www.pricescope.com /diamonds/x20437.htm (483 words)

	African Blue Pietersite Pendant in 14KTGF
		Like other chatoyant stones this piece seems to be alive as it changes character with movement and light.
		This beautiful pendant is exceptionally chatoyant and measures approximately 2-1/2" x 1" wide at the widest part of the design.
		This is AAA Grade Pietersite, an exotic looking variety of tigereye, is a mysterious stone blending chatoyant colors of blues, browns, golds, and reds.
	www.cryztalvisions.com /index.cfm/fa/items.main/parentcat/11458/subcatid/0/id/58416 (484 words)

	AllRefer.com - cat's-eye, Mineral (Mineralogy And Crystallography) - Encyclopedia
		The optical effect, known as chatoyancy, is caused by the reflection of light from very thin, closely spaced filaments in parallel arrangement within the stone.
		True cat's-eye, a variety of chrysoberyl from Sri Lanka and Brazil, is the most valuable, but some quartz, tourmaline, and a few other minerals that display chatoyancy are also used as gems.
		Its name is derived from its supposed resemblance to the eye of a cat.
	reference.allrefer.com /encyclopedia/C/catseye.html (216 words)

	Pietersite beads
		It's really quite pretty-also known as tiger opal, it has areas of chatoyancy on a brown to greyish background, with lots of color mottling and lots of other colors mixed in, even some golds.
		It's really quite pretty-also known as tiger opal, it has areas of chatoyancy on a brown to greyish background, with lots of color mottling and lots of other colors mixed in.
		There are reds and blacks here, golden brown areas reminiscent of tigereye (complete with chatoyance) and to me, the prettiest of all are the beads that tend towards a bluish-lilac in color.
	www.jewelweaver.com /storefront.asp?pageno=41&cat=Pietersite (1466 words)

	Eye on Tigereye: July 2000 Feature Story: Lapidary Journal
		No one seems to know for sure, and we suspect that the haziness of its history is related to some shady dealings when the material was first introduced to Europe and the U.S., especially since it may have been confused (deliberately or otherwise) with cat's-eye (see Questions 11 and 12).
		These partly blue, partly golden chatoyant stones are particularly interesting, and we found that they were much better sellers than either solid tigereye or solid hawk's-eye, although the fact that the University of California at Berkeley's colors are blue and gold might have helped skew our sales in Berkeley.
		Just like tigereye and the rest of the clan, pietersite is a chatoyant, silicified crocidolite asbestos, but its appearance is quite different because it's been broken into fragments (brecciated, in mineralogical terms), stirred around, and recemented by silica.
	www.lapidaryjournal.com /feature/jul00str.cfm (3615 words)

	Gem Hut - Tiger's Eye Gemstones
		Chatoyancy, appearing in these varieties of quartz, is caused by fibrous inclusions.
		They are generally cut en cabochon, but is often cut into round pieces for necklaces and pendants.
	www.gemhut.com /tiger.htm (138 words)

	malachiteCH03.htm
		Chatoyancy is a Phenomenon of certain minerals which causes it to exhibit concentrated bands of reflected light across the polished face of the mineral.
		Malachite with Chatoyancy is very rare and very beautiful.
		It forms in a botryoidal (bubbly) or stalactitic form (long tubes) which when cut, gives the agate-like banding or swirling patterns.
	www.skyesgems.com /store/rough/azurite-malachite/malachiteCH03.htm (129 words)

	Chatoyancy
		Acuñado del francés, significando el "ojo de gato," el chatoyancy se presenta de la estructura fibrosa de un material, como en cuarzo del ojo del tigre, o de inclusiones fibrosas o las cavidades dentro de la piedra, como en el chrysoberyl del ojo de gato.
		En gemology, el chatoyancy es un efecto óptico de la reflexión visto en ciertas piedras preciosas.
	www.yotor.net /wiki/es/ch/Chatoyancy.htm (177 words)

	[Jewelry making - Article 00808] - [Orchid] Chatoyant blue beryl
		Of course because of the clarity of the stuff the chatoyancy is not as strong as in the seafoam green I have.
		Actually some of it is facet grade but with chatoyancy.
		I'm cutting a piece of the green that when held from one direction is nearly clear with a few kind of lightish spots where the ends of the tubes appear and from another viewing angle is opaque, but the color pops out.
	www.ganoksin.com /orchid/archive/200307/msg00808.htm (362 words)

	Tiger Eye Eggs
		Comment: These specimen were selected among hundreds for their superb cat's eye like chatoyancy, and golden yellow color.
		Comment: This specimen was selected among a hundred for it's superb cat's eye like chatoyancy, and golden yellow color.
		Comment: These specimen were selected among hundreds for theirr superb cat's eye like chatoyancy, and golden yellow color.
	www.kashmirblue.com /Coloredstones/Pietersite/tigereggs.html (158 words)

	Cat's Eye - Chatoyancy is a fancy name for a fancy gemstone - JewelryDays.com
		Chatoyancy is a fancy name for a fancy gemstone.
		Chatoyancy is a fancy name for a fancy gemstone
		Better known as a cat's eye this stone is named for the actions of...a cat's eye when exposed to light.
	search.jewelrydays.com /cgi/u/1054/keyword.cgi?k=65 (261 words)

	Cats eye
		This optical phenomenon, called chatoyancy, is caused by light reflecting off of parallel bundles of tiny hollow tubes or fibrous crystals of another mineral inside the gemstone.
		The chatoyancy might disappear completely on a cloudy day or under fluorescent lights.
		Among the most intriguing members of the gem kingdom are those reflecting bright bands of light that form stars and cat’s eyes.
	www.esmerald.com /cats_eye.shtml (360 words)

	Crystal Terminology
		Chatoyancy - Bands of light and dark that vary in width and hue as the stone is turned in the light.
		Asterism- Shining lines that cross one another like rays from a star, caused by light reflected by a series of microscopic canals.
		Cleavage - A mineral's tendency to split when force is applied, leaving a flat surface.
	www.sleeppost.com.sg /terminology.html (247 words)

	Multicolour.com > Gem Library > Gemstones Varieties > Fibrolite
		Fibrolites are frequently fashioned en cabochon and are well known for their remarkable chatoyancy or cats eye effect.
		The chatoyant effect is a result of the reflection of light from the fibrous material.
		They have one direction of cleavage parallel to one pair of the prism faces and are frequently fibrous, hence the name fibrolite.
	www.multicolour.com /gemstones/fibrolite.html (299 words)

	African Opal Cat's Eye Cabochons
		The is definite chatoyancy which is evident in the opal.
		A nice chatoyancy is quite visible in the opal.
		The is a larger high domed cab that will add the interesting quality of chatoyancy to your next jewelry project.
	www.opalopal.com /africanopalcatseyecabochons.htm (400 words)

	Navel, Sacral plexus Chakra/Orange gemstone PSPv7 tubes and their aspects by the GemstoneDiva
		Have mentioned chatoyancy throughout these pages because I am very attracted to any gemstone that exhibits this phenomenon, which is said to bring flashes of insight and deflect negativity from a gem that posesses it.
		Since most people have probably seen the white Moonstone, which is used a lot in jewelry, this gem is a good example of what chatoyancy is...
		Moonstone belongs to the Albite and Orthoclase mineral families, both of which are grouped as Feldspars and most Feldspars exhibit some form of chatoyancy.
	masterstoneman.com /gsd_navel.html (1277 words)

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In the News (Thu 17 Dec 09)