A crystilline material formed by rare planetary forces beneath the surface of the planet, eventually forming large columns of crystal underground that puncture through the surface.
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When a colony is created on a planet that has Mithrillite, these structures are erected to bring the valuble crystal to the serface. This allows special colecting vehicles to pick it up from the ground, before heading back to the refineing center.
Edited by Slye_Fox, 01 April 2011 - 21:59.