garnet


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Related to garnet: moonstone, birthstones, Rhodolite garnet

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 ?
Media Contact: Eric Hendrixson, Garnet Volkswagen, 855-793-2171, ehendrixson@garnetvw.
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Like the MQ Garnet, it measures thicknesses, refractive indices and absorption coefficients of transparent films from 0 nm to 30 microns thick.
Cathy Jean - This is cheap-chic headquarters for shoes, and we zeroed in on a pair of killer high-heeled sandals in a choice of silver, black, red or garnet for $59.
Anderson at the California Institute of Technology in Pasadena contends the transition zone holds both olivine and a high concentration of eclogite -- a rock made of garnet and clinopyroxene.
In this changing retail environment, Bazaarvoice today spotlighted Garnet Hill for its innovative, customer-focused holiday marketing strategies using Bazaarvoice for ratings and reviews.