Obsidian is a volcanic glass rock with conchoidal fracture. This sample comes from Mexico.

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Photo credit: © José María Barres Manuel / Alamy / Afripics
License: Royalty Free
Model Released: No

Keywords: black, brittle, close, conchoidal, extrusive, fracture, geology, glass, igneous, lava, mexico, obsidian, petrology, rock, sample, volcanic