Look up: obsidian

1. Obsidian
   a form of natural volcanic glass used to make projectile points and other tools
   Found on http://www.encyclo.co.uk/visitor-contrib
   
   
2. Obsidian
   A super-chilled igneous rock, black in colour and glassy in appearance. Fractures conchoidally. Often formed due to contact with cold seawater as the silicate minerals cool almost immediately, restricting mineral growth. Can also be called volcanic glass.
   Found on http://www.geologyrocks.co.uk/glossary/l
   
   
3. obsidian
   [n] - acid or granitic glass
   Found on http://www.webdictionary.co.uk/definitio
   
   
4. obsidian
   very viscous lava, rich in silica and lakales,..that..may solidify to bubble-free volcanic glass. Category: The cosmos • a dark, hard, glassy volcanic rock, usually having the same composition as volcanic granite. Category: Chemistry
   Found on http://www.mijnwoordenboek.nl/definition
   
   
5. obsidian
   Natural glass produced by volcanic action. It is usually black or black-banded, and can be cut and polished and used as a gemstone.
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6. Obsidian
   Ob·sid'i·an noun [ Latin Obsidianus lapis , so named, according to Pliny, after one Obsidius , who discovered it in Ethiopia: confer French obsidiane , obsidienne . The later editions of Pliny read Obsianus lapis , a...
   Found on http://www.encyclo.co.uk/webster/O/5
   
   
7. obsidian
   <chemical> A kind of glass produced by volcanoes. It is usually of a black colour, and opaque, except in thin splinters. ... In a thin section it often exhibits a fluidal structure, marked by the arrangement of microlites in the lines of the flow of the molten mass. ... Origin: L. Obsidianus l...
   Found on http://www.mondofacto.com/facts/dictiona
   
   
8. obsidian
   noun acid or granitic glass formed by the rapid cooling of lava without crystallization; usually dark, but transparent in thin pieces
   Found on http://wordnetweb.princeton.edu/perl/web
   
   
9. Obsidian
   • (n.) A kind of glass produced by volcanoes. It is usually of a black color, and opaque, except in thin splinters.
   Found on http://thinkexist.com/dictionary/meaning
   
   
10. obsidian
    natural glass of volcanic origin that is formed by the rapid cooling of viscous lava. Obsidian is extremely rich in silica (about 65 to 80 percent), ... [9 related articles]
    Found on http://www.britannica.com/eb/a-z/o/3
    
    
11. Obsidian
    Glassy dark colored volcanic rock. Usually composed of rhyolite.
    Found on http://www.physicalgeography.net/physgeo
    
    
12. Obsidian
    A volcanic glass that may be clear, black, brown or green in color, which is one of the finest raw materials for the chipping of stone tools.
    Found on http://www.encyclo.co.uk/visitor-contrib
    
    
13. obsidian
    obsidian (obsid'ēun) , a volcanic glass, 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, ...
    Found on http://www.infoplease.com/ce6/sci/A08363
    
    
14. Obsidian
    Obsidian is an extrusive igneous rock that is composed mainly of the minerals feldspar and quartz. It has been used as a natural form of glass for its cutting properties since prehistoric times - being known as volcanic glass - and today is used as a gemstone.
    Found on http://www.probertencyclopaedia.com/brow
    
    
15. obsidian
    Black or dark-coloured glassy volcanic rock, chemically similar to granite, but formed by cooling rapidly on the Earth's surface at low pressure. The glassy texture is the result of rapid cooling, which inhibits the growth of crystals. Obsidian was valued by the early civilizations of Mexico for making sharp-edged tools and ceremonial s...
    Found on http://www.talktalk.co.uk/reference/ency
    
    
16. Obsidian
    A black or dark-colored volcanic glass, usually composed of rhyolite.
    Found on http://midju.tripod.com/glossary.html
    
    
17. Obsidian
    `Obsidian` is a naturally occurring volcanic glass formed as an extrusive igneous rock. It is produced when felsic lava extruded from a volcano cools rapidly with minimum crystal growth. Obsidian is commonly found within the margins of rhyolitic lava flows known as `obsidian flows`, where the chemic...
    Found on http://en.wikipedia.org/wiki/Obsidian
    
    
18. Obsidian
    (comics) image= --> `Obsidian` is a fictional superhero published by DC Comics. He first appeared in All-Star Squadron #25 (September 1983), and was created by Roy Thomas and Jerry Ordway. According to an Infinity, Inc. letter page, Obsidian was named "Todd" after a friend of...
    Found on http://en.wikipedia.org/wiki/Obsidian
    
    
19. Obsidian
    (Transformers) `Obsidian` is the name given to several fictional characters in the various Transformers universes. Beast Machines: Oddly Obsidian`s tech specs have little or nothing to do with the character as seen on the show, instead being described as a simple drone-general attaché. His...
    Found on http://en.wikipedia.org/wiki/Obsidian
    
    
20. Obsidian
    (video game) `Obsidian` is a 1996 computer game created by Rocket Science Games for Mac OS and Windows platforms. Based on a game design outline by VP of Development/Creative Director, Bill Davis, and written by Howard Cushnir and Adam Wolff, the genre of the game was a first-person 3-...
    Found on http://en.wikipedia.org/wiki/Obsidian