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Obsidian

Obsidian

E417/0217

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Credit

DOUG MARTIN / SCIENCE PHOTO LIBRARY DOUG MARTIN / SCIENCE PHOTO LIBRARY

Caption

Obsidian. Lump of the volcanic rock obsidian. Obsidian is formed when volcanic lava is rapidly cooled on contact with water. The rock is mainly composed of silicon dioxide with impurities, such as iron, which give its black colour. Obsidian was used by Neolithic people to make tools because it leaves sharp edges when fractured.

Release details

Model release not required. Property release not required.

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