Labradorite: A rock with microscophic spectral projections, which' colors can only be viewed from certain angles.

Legend has it, that Aurora Borealis was trapped in this rock, until an eskimo warrior found it and released the light with his spear. However, not all of the light was released, and this is some of the remaining light.

Here's the untouched version: http://www.furaffinity.net/view/16566148/