agate

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agate

(ăg`ĭt), translucent, cryptocrystalline 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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 and a subvariety of chalcedonychalcedony
[from Chalcedon], form of quartz the crystals of which are so minute that its crystalline structure cannot be seen except with the aid of a microscope. Chalcedony has a waxy luster and is translucent to transparent.
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. Agates are identical in chemical structure to jasper, flint, chert, petrified wood, and tiger's-eye, and are often found in association with opal. The colorful, banded rocks are used as a semiprecious gemstone and in the manufacture of grinding equipment. An agate's banding forms as silica from solution is slowly deposited into cavities and veins in older rock. The stones can be artificially stained to produce combinations of color more vivid than those found in the natural state. The cutting and staining of agates has long been centered at Idar-Oberstein, Germany. Important sources of agate are Brazil, Uruguay, and the United States (Oregon, Washington, and around Lake Superior). The moss agate or mocha stone contains visible impurities in the form of dendritic shapes that resemble moss. See onyxonyx
, variety of cryptocrystalline quartz, differing from agate only in that the bands of which it is composed are parallel and regular. Its appearance is most striking when the bands are of sharply contrasting colors; black and white specimens are often used for cameos.
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.

Agate

 

a mineral; a variety of chalcedony in the form of a dense, cryptocrystalline aggregate of fibrous or radial quartz formations (Si02)—so-called quartzite or α-tridymite. The mineral is characterized by multiple interstratification of thin (up to 10 microns), variously colored layers. The hardness of agate on the mineralogical scale is 6.0–6.5. The following varieties are recognized depending on the combination of colors in the layers—onyx (white and black layers), carnelian (red and white), sardonyx (reddish brown and white), and agates (bluish gray and white). Agate occurs in veins, in geodes, in amygdules among igneous rocks, and in the tuffs of the last. It is used as an industrial or semiprecious stone and in the manufacture of technical articles (bearing stones, prisms for scales, and so on). Agate is colored artificially to obtain bright, decorative forms.

G. P. BARSANOV

agate

[′ag·ət]
(graphic arts)
A type size in printing of about 5½ points, where 72 points equals 1 inch.
(mineralogy)
SiO2 A fine-grained, fibrous variety of chalcedony with color banding or irregular clouding.

agate

symbolizes health; supposed to relieve snake and scorpion bites. [Class. and Medieval Legend: Leach, 27]
See: Health

agate

confers this power. [Rom. Folklore: Brewer Dictionary,15]

agate

1. an impure microcrystalline form of quartz consisting of a variegated, usually banded chalcedony, used as a gemstone and in making pestles and mortars, burnishers, and polishers. Formula: SiO2
2. a playing marble of this quartz or resembling it
References in periodicals archive ?
Although the clip pen is Detectamet's most popular design, Agata needed a stick pen for her specific requirements.
La prima donna y la Agata tienen momentos muy agotadores.
The Agata DSO project has NI 43-101-compliant proven and probable reserves of 9.
NAKED TRUTH: A bare Iron Man BEST VIEW: Crowds alongside the Iron Man await the arrival of the Olympic torch on Friday COVER-UP: Agata Oleksiak's jumpsuit adorns an Iron Man
Technology built for AGATA will help improve gamma ray machines for medical imaging and provide the expertise to develop portable radiation detectors for dirty bombs and radioactive waste.
Apart those involving Agata, there were 26 cases of magic and witchcraft in the village of Ulvila between 1674 and 1698.
Return flight from Bristol to Rome Return airport to hotel transfers Seven nights in a twin or double bedded room with private facilities at the Villa Angelina, Sant Agata on B& B basis Other hotels in Santa Agata & Sorrento on B& B or half board basis available Services of a tour manager Sorrento & The Bay of Naples from Bristol Airport www.
Bernie took the title when her closest rival, Polish world weightlifting champion Agata Wroebal, failed to finish the final event.
Recuerda a las boludas de la plata, a la coyoacanense Agata, a Mariano y sus bellezas, a la Wornat y sus luces y a la despechada Constanza: "dudo sobre la utilidad de mi experiencia, pongo en crisis la idea de una cronica".
Winendynme (Corey Nakatani), Five Nickels (Tyler Baze) and Agata (Victor Espinoza).