By: Hai Shunxi
Obsidian is natural glass created by rapid cooling of molten rock, or magma, associated with volcanoes. This "chilling" prevents crystallization of the minerals that make up most other rocks formed...
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By: Andrea Theisson
Obsidian is an igneous rock, formed when lava cools very quickly, which disallows the formation of any crystalline structures. Vitreous, it is a glass-like rock which takes several forms depending...
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