garnet


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garnet,

name applied to a group of isomorphic minerals crystallizing in the cubic system. They are used chiefly as gems and as abrasives (as in garnet paper). The garnets are double silicates; one of the metallic elements is calcium, magnesium, ferrous iron, or manganese and the other aluminum, ferric iron, or chromium. Six varieties (of which there are also intermediate forms) are distinguished according to composition—grossularite (calcium-aluminum), pyrope (magnesium-aluminum), spessartite (manganese-aluminum), almandite (iron-aluminum), andradite (calcium-iron), and uvarovite (calcium-chromium). Grossularite occurs commonly in a red, green, yellow, or brown shade, depending on the impurities; if pure it would be colorless. The yellow and brown stones, coming chiefly from Sri Lanka, are used as gems under the names essonite (or hessonite) and cinnamon stone; sometimes they are miscalled hyacinth. Grossularite is found also in the Transvaal, in Mexico, and in Oregon. The most popular variety of garnet is the ruby-red pyrope from Bohemia, S Africa, and Arizona, sold as Cape ruby and Arizona ruby. Rhodolite, a mixture of pyrope and almandite from North Carolina, is rose-red or purple. Spessartite, a brown to brownish-red garnet from Bavaria, Sri Lanka, and parts of the United States, is seldom used for jewelry. Deep red, transparent almandite is the carbuncle; it was formerly a very popular gem. Almandites come chiefly from Brazil, India, and Sri Lanka; Australia and parts of the United States are also important sources. Andradite, a very common variety, is usually some shade of red, black, brown, yellow, or green. Gem varieties include topazolite, similar in color and transparency to topaztopaz
, aluminum silicate mineral with either hydroxyl radicals or fluorine, Al2SiO4(F,OH)2, used as a gem. It is commonly colorless or some shade of pale yellow to wine-yellow; pale blue and pale green also occur, but natural red stones are
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; demantoid, a green variety with a high dispersion and adamantine luster, sometimes miscalled olivine and Uralian emerald; and black melanite. Demantoid is found in the Urals, and the other andradites come chiefly from Europe and the United States. Uvarovite, an emerald-green variety from Russia and Finland, is rarely suitable for gem use. Garnet occurs in many different kinds of rocks—grossularite, in metamorphosed impure limestones; pyrope, in basic igneous rocks; spessartite, in granite rocks; almandite, in schists and other metamorphic rocks as well as in igneous rocks; andradite, in serpentine; and uvarovite, chiefly in serpentine.

garnet

[′gär·nət]
(mineralogy)
A generic name for a group of mineral silicates that are isometric in crystallization and have the general chemical formula A3B2(SiO4)3, where A is Fe2+, Mn2+, Mg, or Ca, and B is Al, Fe3+, Cr3+, or Ti3+; used as a gemstone and as an abrasive.

garnet

A mineral having many varieties in color and constituents but the same general chemical formula, with an isometric crystal structure.

garnet

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

garnet

1
any of a group of hard glassy red, yellow, or green minerals consisting of the silicates of calcium, iron, manganese, chromium, magnesium, and aluminium in cubic crystalline form: used as a gemstone and abrasive. Formula: A3B2(SiO4)3 where A is a divalent metal and B is a trivalent metal

garnet

2
Nautical a tackle used for lifting cargo

Garnet

(1)
A graphical object editor and Macintosh environment.

Garnet

(2)
A user interface development environment for Common Lisp and X11 from The Garnet project team. It helps you create graphical, interactive user interfaces.

Version 2.2 includes the following: a custom object-oriented programming system which uses a prototype-instance model. automatic constraint maintenance allowing properties of objects to depend on properties of other objects and be automatically re-evaluated when the other objects change. The constraints can be arbitrary Lisp expressions. Built-in, high-level input event handling. Support for gesture recognition. Widgets for multi-font, multi-line, mouse-driven text editing. Optional automatic layout of application data into lists, tables, trees or graphs. Automatic generation of PostScript for printing. Support for large-scale applications and data visualisation.

Also supplied are: two complete widget sets, one with a Motif look and feel implemented in Lisp and one with a custom look and feel. Interactive design tools for creating parts of the interface without writing code: Gilt interface builder for creating dialog boxes. Lapidary interactive tool for creating new widgets and for drawing application-specific objects. C32 spreadsheet system for specifying complex constraints.

Not yet available: Jade automatic dialog box creation system. Marquise interactive tool for specifying behaviours.

ftp://a.gp.cs.cmu.edu/usr/garnet/garnet.
References in periodicals archive ?
In addition to magnetite, magnetic separation with a stronger hand-held magnet used at different distances (Lemme samples Nos 3501-3507 were mixed to produce the necessary amount) allowed us to separate five more different fractions dominated by the following minerals: hematite, ilmenite, garnets, amphiboles and residue (zircon).
From the point of view of the practical applications of ultrathin garnet films, the RF magnetron sputtering process is most suitable for depositing amorphous-phase films onto GGG substrates, when followed by high-temperature annealing in air atmosphere at 550-650[degrees]C (depending on the level of bismuth substitution).
We have 3D models to better understand the deposit and efficiently access the garnet," added Barton, noting the influence of Volvo Site Simulation on the growth of his fleet and business.
On the other hand, many petrologists would attribute the rare development of staurolite as compared with garnet, biotite and kyanite to a more restricted P-T range (Deer et al., 1992) or a limited range of oxygen fugacity (Ganguli, 1968).
During the June 2015 JCK gem and jewellery show in Las Vegas, Nevada, USA, news circulated about some attractive new purple garnets from East Africa.
This phenomenon, known as the anomalous Hall effect, indicated that the graphene was ferromagnetic, the type of magnetism exhibited by iron and yttrium iron garnet. "The graphene just borrows the magnetic properties," says Allan MacDonald, a condensed matter physicist at the University of Texas at Austin.
Garnet Tobacco is Cree, and his artistic style has been shaped by the traditions of Aboriginal peoples whose ancestral home is northern Manitoba.
You can buy one Acer Palmatum Dissectum Atropurpureum (Garnet)for PS17.99 or buy two for PS29.98 and save PS6 off RRP.
But that was not enough to overcome Garnet's redemptive victory for the Bronx, and on his third attempt.
A First Nation-owned garnet mining company near Sudbury has launched a major expansion with a new processing plant.