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, 15:19, 27 August 2014
==Useful links==
* [http://geology.com/rocks/igneous-rocks.shtml General definition and pictures]
* [http://en.wikipedia.org/wiki/Igneous_rock Igneous rock (Wikipedia)]
* [http://geology.about.com/cs/basics_roxmin/a/aa011804a.htm Origins, types, textures]
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