amethyst

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amethyst

(ăm`əthĭst) [Gr.,=non-drunkenness], variety of quartzquartz,
one of the commonest of all rock-forming minerals and one of the most important constituents of the earth's crust. Chemically, it is silicon dioxide, SiO2.
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, violet to purple in color, used as a gem. It is the most highly valued of the semiprecious quartzes. It is associated with a number of superstitions, being regarded as a love charm, as a potent influence in improving sleep, and as a protection against thieves and drunkenness. Brazil, Uruguay, Siberia, Sri Lanka, and parts of North America are important sources of supply. The so-called Oriental amethyst, or purple sapphire, is not quartz but a variety of corundum, a much harder and rarer stone.

Amethyst

 

a mineral, a violet or sky blue-violet variety of quartz (SiO2). On heating to 300–350°C, amethyst becomes yellow or is discharged. Decolorized amethyst reacquires its color after exposure to X rays. The mineral occurs in quartz veins, granitic rocks, amygdules of volcanic rocks, and sometimes in sedimentary rocks, such as silicon salts. The best specimens are used for jewelry and as ornamental stones. Especially fine are amethysts from the Urals and Brazil. A blue-violet variety of corundum is known in the jeweler’s craft as eastern amethyst.

amethyst

[′am·ə‚thist]
(mineralogy)
The transparent purple to violet variety of the mineral quartz; used as a jeweler's stone.

amethyst

February. [Am. Gem Symbolism: Kunz, 319–320]

amethyst

preserved soldiers from harm; gave them victory. [Gem Symbolism: Kunz, 58]

amethyst

provides protection against drunkenness; February birthstone. [Gem Symbolism: Kunz, 58–59]

amethyst

1. a purple or violet transparent variety of quartz used as a gemstone. Formula: SiO2
2. a purple variety of sapphire; oriental amethyst
3. the purple colour of amethyst
References in periodicals archive ?
Nicky Adams gets a four- day ban from the Brighton stewards for his riding of Amethystine (Ron Hodges), who finishes fourth, but is subsequently disqualified behind Tarn Pure (Charlie Moore/Brian Rouse) in the 10-furlong handicap.
Top left, Boots No17 two coat Lip & Mix Lip Shine in Amethystine with Lipshine Clear (pounds 2.
She lets her tasselled silken cloak slip down, and only her purple ring still glows, her vinous, her amethystine ring.