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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.

Domain Referenced Description
The Digital Object Identifier System Doi.orgThe Digital Object Identifier System

Encyclopedia - Online Dictionary | Encyclopedia.com: Get facts, articles, pictures, video Encyclopedia.comEncyclopedia - Online Dictionary | Encyclopedia.com: Get facts, articles, pictures, video

Amethyst Galleries  Mineral Gallery Galleries.comAmethyst Galleries Mineral Gallery

Google Google.com.auGoogle

B.C. Government Home - Province of British Columbia Gov.bc.caB.C. Government Home - Province of British Columbia

The Megalithic Portal and Megalith Map: Megalithic.co.ukThe Megalithic Portal and Megalith Map:

Mineralogy Database - Mineral Collecting, Localities, Mineral Photos and Data Mindat.orgMineralogy Database - Mineral Collecting, Localities, Mineral Photos and Data

National Institutes of Health (NIH) - Home Page Nih.govNational Institutes of Health (NIH) - Home Page

U.S. and Canada Obsidian Source Catalog Sourcecatalog.comU.S. and Canada Obsidian Source Catalog

Welcome to the USGS - U.S. Geological Survey Usgs.govWelcome to the USGS - U.S. Geological Survey

[WorldCat.org] Search for books, music, videos, articles and more in libraries near you Worldcat.org[WorldCat.org] Search for books, music, videos, articles and more in libraries near you