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 ?
Some of these companies also called their versions Alexandrite, others used different names for it such as Wisteria, Twilight, Heatherbloom, Dawn or Pink Luxodine glass.
Marayiannis KB, Vlachos SP Sawa MR Kontoes PP: Efficacy of long- and short pulse alexandrite lasers compared with an intense pulsed light source for epilation: a study on 532 sites in 389 patients.
The exhibit has a rare alexandrite that changes color from dark pink in artificial light to green in sunlight.
Cynosure's products include a broad range of laser and other light-based energy sources, including Alexandrite, pulsed dye, Nd:YAG and diode lasers, as well as intense pulsed light.
The quality Alexandrite, of Sri Lankan origin, has the ability to change colour completely from red in artificial light to green in daylight - which really does need to be seen to be believed.
Here, as with Rodney Street, clients have the choice of two methods of hair removal: the Epitouch 5100 Alexandrite laser and the Skin Soft light treatment.
On pairing fractional lasers with Q-switched Alexandrite lasers for tattoo removal, Dr.
Cynosure's product portfolio is composed of a broad range of energy sources including Alexandrite, diode, Nd: YAG, picosecond, pulse dye, Q-switched lasers, intense pulsed light and radiofrequency technology.
Treatment of Tattoos with a 755 nm Q-switched Alexandrite Laser and 1064 nm Nd: YAG Laser Handpieces Pumped by the Alexandrite Treatment Beam, presented by Eric Bernstein, M.
Treatment of Resistant Tattoos with Picosecond Alexandrite Laser," Robert Weiss, Margaret Weiss, Mary Trageser, Fran Lorden, Karen Beasley, Laser Skin Vein Institute, Baltimore, MD
A Randomized, Split-Face Comparison of Facial Hair Removal With the Alexandrite Laser and Intense Pulsed Light System" in the December issue 2007 of Lasers in Surgery and Medicine found GentleLASE far superior to the IPL from a scientific and patient perspective in testing for hair removal efficacy.
4 includes the first 3 Hz, 125 W, 755 mm Alexandrite laser, an extremely powerful 180W, 1064 nm Nd:Yag laser and a FT Pulsed Light with 5 interchangeable filters.