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 ?
Agata explained that she really liked the feel/shape because she wanted a pen that was easy to use and ensured clear writing.
Fully escorted by a friendly, experienced tour manager Flying direct from Cardiff Departs 2 June & 29 September 2015 Featuring half-board accommodation in Sant' Agata, this wonderful holiday includes escorted visits to Pompeii, Mount Vesuvius and the enchanting Isle of Capri, and a breath taking drive along the Amalfi Coast.
A thousand times more sensitive than any previous detector built, and with an unparalleled level of sensitivity to electromagnetic radiation, AGATA will, at final set up, be able to observe the structure and interior of these rare and exotic nuclei by measuring the gamma rays they emit as they decay.
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Bernie lost narrowly to Agata and they were neck-and-neck going into the last event.
Winendynme (Corey Nakatani), Five Nickels (Tyler Baze) and Agata (Victor Espinoza).
The big, dramatic paintings, with Grosowsky's trademark glossy texture and Caravaggio-style lighting, are actually by Tsuguya Agata, a 23-year-old Japanese painter who is a former student of the popular Lane Community College art teacher.
One of my favorite such pieces in this anthology is the lovely Nocturne in B-flat for piano by Maria Agata Szymanowska (1789-1831).
But on Monday, Dusan and Agata Gurzan and kids Vanesa, two, Adrian, 12, and Nikola, 13, were woken by police.
The Roman milieu of Leto's Academy is at the center of Maria Agata Pincelli's analysis and interpretation of Filetico's teaching career at the Studium Urbis and his two invectives against the "corruptores Latinitatis.
As he takes the child to the bedroom, Agata recalls how her own mother did the same thing to her when she was that age.