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Obsidian references on wikipedia
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 without crystal growth. Obsidian is commonly found within the margins of rhyolitic lava flows known as obsidian flows, where the chemical composition (high silica content) induces a high viscosity and polymerization degree of the lava.
Obsidian is a naturally occurring volcanic glass formed as an extrusive igneous rock. It is produced when felsic lava extruded from a volcano cools without crystal growth. Obsidian is commonly found within the margins of rhyolitic lava flows known as obsidian flows, where the chemical composition (high silica content) induces a high viscosity and polymerization degree of the lava.
| Description | |||
 Doi.org | The Digital Object Identifier System | ||
| Encyclopedia.com | Encyclopedia - Online Dictionary | Encyclopedia.com: Get facts, articles, pictures, video | ||
| Galleries.com | Amethyst Galleries Mineral Gallery | ||
| Google.com.au | Google | ||
| Gov.bc.ca | B.C. Government Home - Province of British Columbia | ||
| Megalithic.co.uk | The Megalithic Portal and Megalith Map: | ||
| Mindat.org | Mineralogy Database - Mineral Collecting, Localities, Mineral Photos and Data | ||
| Nih.gov | National Institutes of Health (NIH) - Home Page | ||
| Sourcecatalog.com | U.S. and Canada Obsidian Source Catalog | ||
| Usgs.gov | Welcome to the USGS - U.S. Geological Survey | ||
| Worldcat.org | [WorldCat.org] Search for books, music, videos, articles and more in libraries near you | ||
