Picture of a piece of peridotitic (green) mantle xenolith within a (dark) volcanic bomb from the Vulkan-Eifel, Germany. Coin of one euro for scale.
<a href="//commons.wikimedia.org/wiki/User:Woudloper" title="User:Woudloper">Woudloper</a> 10:57, 31 January 2007 (UTC)
CC BY-SA 1.0
I made this picture. (originally uploaded as Image:100 5725.JPG)