Obsidian

Obsidian

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Credit: MICHAEL SZOENYI/SCIENCE PHOTO LIBRARY

Caption: Obsidian sample. Obsidian is a vitreous (glassy, non-crystalline) mineral that forms in extrusive rocks that are cooled rapidly, such as in volcanic eruptions. The reddish colour is where tuff from previous volcanic eruptions has been trapped in the rock as it cooled. This sample is from the Canadas caldera, Teide volcano, Tenerife, Canary Islands.

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Keywords: atlantic, canadas caldera, canary islands, earth science, geological, geology, glass, glassy, obsidian, rock, rocks, sample, teide volcano, tenerife, tuff, vitreous, volcanic

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