chatoyancy , auch: chatoyance

Approximately 10 per cent of the rough material would also exhibit chatoyancy when polished.

The best binghamite compares with top pietersite for color and chatoyancy.

The gems are usually cut en cabochon in order to best display their chatoyancy.

When polished by a lapidary the thomsonites sometimes display chatoyancy.

French polishing is a wood finishing technique that results in a very high gloss surface, with a deep colour and chatoyancy.

Glass optical cable can also display chatoyancy if properly cut, and has become a popular decorative material in a variety of vivid colors.

While pietersite has the lovely chatoyancy of tiger eye, it is not found in continuously structured bands.

This chatoyancy can be subtranslucent to opaque.

This variety exhibits pleasing chatoyancy or opalescence that reminds one of an eye of a cat.

Furthermore, rubies can show color changes-though this occurs very rarely-as well as chatoyancy or the "cat's eye" effect.

Cymophane has its derivation also from the Greek words meaning 'wave' and 'appearance', in reference to the chatoyancy sometimes exhibited.

Fibrous satin spar exhibits chatoyancy (cat's eye effect).

Kyanite has been used as a semiprecious gemstone, which may display cat's eye chatoyancy, though this use is limited by its anisotropism and perfect cleavage.

Stones and crystals that go through this process are referred to as brecciated, creating a finished product with multiple colors, hues and superb chatoyancy.

In addition to simple body colour, minerals can have various other distinctive optical properties, such as play of colours, asterism, chatoyancy, iridescence, tarnish, and pleochroism.

Play-of-color, labradorescence, iridescence, adularescence, chatoyancy, asterism, aventurescence, lustre and color change are all phenomena of this type.

Seraphinite is generally dark green to gray in color, has chatoyancy, and has hardness between 2 and 4 on the Mohs scale of mineral hardness.

The effect is a form of chatoyancy, caused by the interaction of light rays with the microcrystals in the pearl's surface, and it somewhat resembles Moiré silk.

This effect is often highly sought after, and is sometimes referred to as "wet look", since wetting wood with water often displays the chatoyancy, albeit only until the wood dries.

All fibrous color variations will have a superb and striking chatoyancy, the bright and subtly changing shimmer of color that moves along the surface of a gemstone as it is viewed from varying angles.

Some minerals exhibit unusual optical phenomena, such as asterism (the display of a star-shaped luminous area) or chatoyancy (the display of luminous bands, which appear to move as the specimen is rotated).

It was apparently free from alteration, had specific gravity of 4.28 (taken on a very pure fragment), had a bright green chatoyancy at certain angles, and was like glass in its broad obsidian-like conchoidal fracture.

Chatoyancy ("cat's eye") is the wavy banding of colour that is observed as the sample is rotated; asterism, a variety of chatoyancy, gives the appearance of a star on the mineral grain.

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 within the stone, as in cat's eye chrysoberyl.