k Obsidian Obsidian. This pyroclastic material formed when slowmoving, silicarich lava cooled rapidly. It is also known as volcanic glass. Photographed in California, USA. Stock Photo - Afloimages
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Obsidian Obsidian. This pyroclastic material formed when slow moving, silica rich lava cooled rapidly. It is also known as volcanic glass. Photographed in California, USA.
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Obsidian

Obsidian. This pyroclastic material formed when slow-moving, silica-rich lava cooled rapidly. It is also known as volcanic glass. Photographed in California, USA.

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158124555

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