Obsidian rocks, Landmannalaugar, Iceland

Obsidian is a naturally occurring volcanic glass formed as an extrusive igneous rock. It is produced when felsic lava extruded from a volcano cools without crystal growth. Higher resolution images available from rth@arctic-images.com (there is a licensing fee depending on the use).

Credit

Ragnar Sigurdsson (arctic-images.com) (distributed via imaggeo.egu.eu)

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