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A Natural Glass
 Photos by Steve Mattox No reproduction without permission |
Glass is a common material which can be found in a
natural state in many parts of the world. The first glass was made by volcanoes and is called obsidian.
Obsidian is a shiny, usually black, translucent material. It is formed when volcanic molten lava comes into contact with water and cools quickly.
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Obsidian is mostly made from silicon dioxide (SiO2) with large amounts of impurities such as iron and magnesium.