onyx


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onyx

(ŏn`ĭks), variety of cryptocrystalline 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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, differing from agateagate
, translucent, cryptocrystalline variety of quartz and a subvariety of chalcedony. Agates are identical in chemical structure to jasper, flint, chert, petrified wood, and tiger's-eye, and are often found in association with opal.
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 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. Onyx was used in Roman times for the fabrications of vases and cups. Sardonyx contains onyx and carnelian or sard. "Onyx marble," "Mexican onyx," and "Oriental alabaster" are terms applied to travertinetravertine
, form of massive calcium carbonate, CaCO3, resulting from deposition by springs or rivers. It is often beautifully colored and banded as a result of the presence of iron compounds or other (e.g., organic) impurities.
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.
The Columbia Electronic Encyclopedia™ Copyright © 2013, Columbia University Press. Licensed from Columbia University Press. All rights reserved. www.cc.columbia.edu/cu/cup/
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Onyx

 

a mineral; a variety of agate with alternating black and white bands. Onyx is used as ornamental material or as a gem-stone. Cameos are carved from onyx, with the dark bands serving as the background and the light-colored bands used for the images.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.

onyx

[′än·iks]
(mineralogy)
Banded chalcedonic quartz, in which the bands are straight and parallel; natural colors are usually red or brown with white, although black is occasionally encountered.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

onyx

A banded, varicolored form of quartz, closely related to agate; cut into slabs, polished, and used for decorative building stone.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.

onyx

provokes disagreement and separates lovers. [Gem. Symbolism: Kunz, 98–99]
See: Discord
Allusions—Cultural, Literary, Biblical, and Historical: A Thematic Dictionary. Copyright 2008 The Gale Group, Inc. All rights reserved.

onyx

1. a variety of chalcedony with alternating black and white parallel bands, used as a gemstone. Formula: SiO2
2. a compact variety of calcite used as an ornamental stone; onyx marble. Formula: CaCO3
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

Onyx

A family of graphics supercomputers from SGI that use the MIPS R10000 CPU and range from single-processor workstations to rack-mounted systems with 128 CPUs. They use SGI's InfiniteReality graphics subsystem which processes geometry, imaging and video data in real time.
Copyright © 1981-2019 by The Computer Language Company Inc. All Rights reserved. THIS DEFINITION IS FOR PERSONAL USE ONLY. All other reproduction is strictly prohibited without permission from the publisher.
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