1) American superhero 2) Beautiful stone 3) Dark volcanic glass 4) DC Comics superhero 5) Decorative stone 6) Expensive rock 7) Fictional avatar 8) Fictional gay male 9) Gemstone 10) Glass made of lava 11) Green Lantern character 12) Prized stone 13) Prized mineral 14) Precious gemstone 15) Precious rock
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https://www.crosswordclues.com/clue/obsidian
1) Lava
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https://www.crosswordclues.com/clue/obsidian
A black or dark-colored volcanic glass, usually of rhyolitic (felsic) composition.
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http://jersey.uoregon.edu/~mstrick/geology/geo_glossary_page.html
A black or dark-colored volcanic glass, usually composed of rhyolite.
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http://midju.tripod.com/glossary.html
• (n.) A kind of glass produced by volcanoes. It is usually of a black color, and opaque, except in thin splinters.
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http://thinkexist.com/dictionary/meaning/obsidian/
A black or dark-colored volcanic glass, usually composed of rhyolite.
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http://volcano.oregonstate.edu/glossary/1
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]
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http://www.britannica.com/eb/a-z/o/3
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.
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http://www.encyclo.co.uk/local/20206
<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 lapis, so named, according to Pliny, after one Obsi...
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http://www.encyclo.co.uk/local/20973
A volcanic glass which is one of the finest raw materials for the chipping of stone tools.
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http://www.encyclo.co.uk/local/21815
A glassy igneous rock with a composition similar to granite. The glassy texture is a result of cooli
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http://www.encyclo.co.uk/local/22392
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.
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http://www.encyclo.co.uk/visitor-contributions.php
a form of natural volcanic glass used to make projectile points and other tools
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http://www.encyclo.co.uk/visitor-contributions.php
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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http://www.encyclo.co.uk/visitor-contributions.php
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 , and
Obsius , instead of
Obsidianus lapi...Found on
http://www.encyclo.co.uk/webster/O/5
A glassy igneous rock with a composition equivalent to that of granite.
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http://www.evcforum.net/WebPages/Glossary_Geology.html
Glassy dark colored volcanic rock. Usually composed of rhyolite.
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http://www.physicalgeography.net/physgeoglos/o.html
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.
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http://www.probertencyclopaedia.com/browse/HO.HTM
A lustrous compund of silica found in volcanic lava flows that is usually black, but can be found in grey, red, brown and green varieties. Obsidian has a hardness of 5 on the Mohs Scale
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http://www.saffronart.com/sitepages/jewelry/glossary.aspx
Dark volcanic glass of felsic composition.
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http://www.scientificpsychic.com/etc/geology-glossary.html
A glassy phase of lava, usually black.
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http://www.selectstone.com/architectural-resources/stone-glossary/
noun acid or granitic glass formed by the rapid cooling of lava without crystallization; usually dark, but transparent in thin pieces
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https://www.encyclo.co.uk/local/20974
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...
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https://www.encyclo.co.uk/local/21221
A glassy phase of lava.
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https://www.encyclo.co.uk/local/22191
(Volcanic Silica Glass) Obsidian is the result of volcanic lava coming in contact with water. Often the lava pours into a lake or ocean and is cooled quickly. This process produces a glassy texture in the resulting rock. Iron and magnesium give the obsidian a dark green to black color. Obsidian has been used by ancient people as...
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https://www.encyclo.co.uk/local/23719
No exact match found.
