Earth and the Environment

How does obsidian attain its appearance?

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Like other volcanic glasses, obsidian is a lava that has cooled too quickly for the contained minerals to crystallize.

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Get more facts and information about obsidian . Or, view the full encyclopedia entry from The Columbia Encyclopedia, Sixth Edition.

Similar questions: How does the cooling of obsidian affect crystallization? Why didn't the minerals in obsidian crystallize? [ Hide these questions ]

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