Alexandrite


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alexandrite

[‚al·ig′zan‚drīt]
(mineralogy)
A gem variety of chrysoberyl; emerald green in natural light but red in transmitted or artificial light.

Alexandrite

 

the mineral variety of chrysoberyl, having a composition of BeAl2O6, with an admixture of Cr2O3 (up to 0.5 percent). Thick tabular crystals of a pseudohexagonal habit are characteristic. In sunlight, alexandrite is emerald green; under artificial light, violet-red. The hardness is 8.5 on the mineralogical scale, and the density is about 3,700 kilograms per cubic meter. Alexandrite with a rich color and a weight of more than 2–3 carats is a precious stone of the first class. The finest alexandrites from deposits in the USSR, Brazil, South Africa, Madagascar, and Ceylon are found in pegmatites. Synthetic alexandrite is the name given to the artificially produced, light-green variety of corundum.

alexandrite

type of chrysoberyl typifying undying devotion. [Gem Symbolism: Jobes, 67]
See: Loyalty
References in periodicals archive ?
A retrospective study on the efficacy and complications of Q-switched alexandrite laser in the treatment of acquired bilateral nevus of Ota-like macules.
This geological scenario has occurred only rarely in the Earth's history and, as a result, alexandrite crystals are very scarce indeed.
Faun tail nevus and spinal dysraphism: cosmetic improvement with alexandrite laser epilation.
Effects of the 755-nm Alexandrite laser on fine dark facial hair: Review of 90 cases.
The company stated the Pro-U family of products includes the GentleLase Pro-U long pulse alexandrite laser for hair removal and the treatment of pigmented and vascular lesions, as well as the GentleYag Pro-U long pulse Nd:YAG laser for hair removal and the treatment of spider veins and telangiectasia.
The reason for this change of colour is that these are two examples of a fascinating type of glass known generally as neodymium or Alexandrite glass.
Yapilan bir calismada, hirsutismusu olan hastalarda, yuz bolgesi uygulamasinda alti seans sonunda Alexandrite lazerin IPL yontemine gore anlamli olarak daha etkili oldugu saptanmistir.
There are also sets of diamond cufflinks and a unisex silver ring, set with seven green Alexandrite stones.
Kauvar first uses a Q-switched YAG laser on the tattoo, followed by a Q-switched alexandrite laser (which is better at treating blues and greens) 20 minutes after the first laser.
The bride's jewelry included her mother's pearl necklace, some pearl cluster earrings, and a diamond and alexandrite bracelet given to her by the groom's family.
An Alexandrite or ND: YAG laser is the goldstandard treatment for hair removal and is far superior to Intense Pulsed Light (IPL), which uses filtered light to create heat.
develops and markets aesthetic treatment systems that are used by physicians and other practitioners to perform non-invasive and minimally invasive procedures to remove hair treat vascular and pigmented lesions rejuvenate the skin removes tattoos, liquefy and remove unwanted fat through laser lipolysis and reduce the appearance of cellulite Cynosure's products include a broad range of laser and other light-based energy sources, including Alexandrite, pulse dye, Nd:YAG and diode lasers, as well as intense pulsed light.