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About Obsidian

 Obsidian is a naturally occurring volcanic glass formed as an extrusive igneous rock. It is produced when lava cools rapidly with minimal crystal growth. It is commonly found within the margins of lava flows, where the chemical composition (high silica content) causes a high viscosity which, upon rapid cooling, results in a natural glass forming from the lava. Obsidian is hard, brittle, and amorphous; it therefore fractures with very sharp edges. In the past it was used to manufacture cutting and piercing tools.

In Peru you can find black obsidian and the so called mahogany obsidian(black mixed with brownish red)

drop shaped Master Cabochon made from Obsidian
Master Cabochon made from Osidian
Master Cabochon made from Osidian
drop shaped Master Cabochon made from Obsidian

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