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A large piece of green obsidian found at the end of 35-meter-long underground mine near Guadalajara, Mexico. Ancient miners were unable to complete the job of extracting it.

A large piece of green obsidian found at the end of 35-meter-long underground mine near Guadalajara, Mexico. Ancient miners were unable to complete the job of extracting it.

© John Pint, 2009

Source article: Obsidian in Mexico: gift of the gods
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