obsidian

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obsidian

(ŏbsĭd`ēən), a volcanic glassglass,
hard substance, usually brittle and transparent, composed chiefly of silicates and an alkali fused at high temperature. Composition and Properties of Glass
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, homogeneous in texture and having a low water content, with a vitreous luster and a conchoidal fracture. The color is commonly black, but may be some shade of red or brown, and cut sections sometimes appear to be green. Like other volcanic glasses, obsidian is a lavalava
, molten rock that erupts on the earth's surface, either on land or under the ocean, by a volcano or through a fissure. It solidifies into igneous rock that is also called lava.
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 that has cooled too quickly for the contained minerals to crystallize. In chemical composition it is rich in silica and similar to granite. It is favored by primitive peoples for knives, arrowheads, spearheads, and other weapons and tools.

obsidian

A natural volcanic glass, usually black with a bright luster, that is transparent in thin slabs. See also: Stone

Obsidian

(pop culture)
Introduced in All-Star Squadron #25 (1983) in a story scripted by Roy Thomas and penciled by Jerry Ordway, the living shadow Obsidian joins the list of heroes who have turned to the dark side. Unbeknownst to him, Todd Rice was the child of Alan Scott, the original Green Lantern. Raised in Milwaukee by abusive foster parent James Rice, the teenage Todd resolved to become a hero when he discovered both his “shadow powers” and his long-lost twin, Jennie-Lynn Hayden, with whom he can communicate telepathically. Together they became Jade and Obsidian, founding members of the hero group Infinity, Inc., which comprised those heroes who continued the legacy of the Justice Society of America. Todd can merge his body with his own shadow, becoming either a three-dimensional shadow form or a two-dimensional silhouette. As Obsidian, he possesses superstrength and supervitality, can float weightlessly, and delights in showing his enemies their own dark side. Obsidian's connection with the shadow realm (Shadowlands) and his experience of seeing the darkness within the human soul caused him to go gradually insane. After many of his teammates were killed and Infinity, Inc. disbanded, he waged a one-man war against his biological and adoptive fathers. Under the mentorship of Ian Karkull, an age-old Justice Society nemesis, Obsidian has fought numerous heroes, and also partnered with the princes of darkness Dark Lord Mordru and Eclipso. His family and friends remain hopeful that Obsidian will one day reject the evil that has consumed him.

Obsidian

 

(Latin Obsidianus lapis, “Obsidius’ stone”; according to Pliny the Elder, the rock was discovered in Ethiopia by a certain Obsidius, or more accurately, Obsius), a homogeneous vitreous volcanic rock, usually dark-colored (black, reddish black), with a marked conchoidal fracture. The hardness on Mohs’ scale is 5, and the density, is 2,500–2,600 kg/m3. The rock contains about 0.5 percent water.

Obsidian polishes well. It is formed upon hardening of the viscous varieties of rhyolite lava or rhyodacite lava. Certain varieties of obsidian are used as decorative stones. In the Stone Age and Bronze Age, obsidian was used to make arrowheads, spearheads, knives, and scrapers. At present it is used mainly as an expanding filler for lightweight concretes. Obsidian is found in areas of volcanic activity—for example, in Transcaucasia and on Kamchatka in the USSR, and also in Italy and Mexico.

obsidian

[äb′sid·ē·ən]
(geology)
A jet-black volcanic glass, usually of rhyolitic composition, formed by rapid cooling of viscous lava; generally forms the upper parts of lava flows. Also known as hyalopsite; Iceland agate; mountain mahogany.

obsidian

A natural volcanic glass, usually black, with a bright luster; has relatively low water content.

obsidian

a dark volcanic glass formed by very rapid solidification of lava
References in periodicals archive ?
Obsydian Technologies, LLC, based in Greenwood Village, Colo.
The initial project is a fiber acquisition application to be deployed on Windows NT using Synon's Obsydian development environment and the Obsydian for Windows NT/BackOffice generator.
Obsydian is a client/server application development environment that significantly accelerates the implementation of enterprise-wide business systems through its ability to define and reuse business objects and automatically generate code.
PMSC's choice to use Obsydian to generate its enterprise-class applications is another example of the increasing use of Synon's model-based solutions to architect success for customers on Windows NT.
Under the terms of the development agreement, Microsoft and Synon will work together to build a generator for Obsydian based on the Windows NT(TM) Server operating system that will enable corporate developers, independent software vendors (ISVs) and Microsoft Solution Providers to create robust, business-critical applications for Microsoft BackOffice cost-effectively.
Synon will showcase at Booth 1105 how its Obsydian for Windows NT/BackOffice solution allows automatic generation of "Designed for Microsoft BackOffice" logo compliant code for extending applications to the Windows NT platform.
Chorus Software, a UK-based software house, is successfully developing its financial accounting and business management software using Obsydian for Windows NT/BackOffice.
Obsydian for Windows NT/BackOffice is a result of a close development relationship between Microsoft and Synon and is the first tool to receive this certification.
Synon and IBM will also use the lab to create Obsydian class libraries of business objects that exploit and encourage the use of native AS/400 advanced technologies in the areas of imaging, telephony, multimedia, Internet, data warehousing and Lotus Notes.
stated they are working jointly to deliver Obsydian for Windows NT/BackOffice, the only toolset capable of automatic delivery of native Microsoft BackOffice-based applications that also qualify for the Designed for Microsoft BackOffice Logo and are OLE exploitative.
Note to Editors: Synon is a registered trademark and Obsydian is a trademark of Synon Corporation.