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Obsidienne. Obsidian Cliff, Yellowstone, USA. Noter l'aspect vitreux mis en évidence par le passage de la lumière à travers cette roche.
- Document type:picture
- Picture uploaded by:Thomas Ribière
- Author(s):Thomas Ribière
- Picture type:collaborative picture
- Picture's license:Creative Commons CC-by-sa
- Categories:geology
- Camera:Canon DIGITAL IXUS 850 IS
- Date time:2009-07-03 19:54:01
- Focal distance:4.6mm
- Aperture:F/2.8
- Exposure:1/323s
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