QUOTE (Mrs.CP @ Jul 31 2010, 06:42 AM)
Can you see what I'm seeing in this pic?
If I'm not mistaken - Double refraction. Cooler than the other side of the pillow!
What a coincidence, I just learned (last night) about this effect in my Rocks and Minerals Guide which I bought two days ago.
Not all crystals have this effect. The crystal splits light into two rays: Ordinary, which doesn't deviate and Extraordinary which shifts when the crystal is rotated.
Creates that wicked cool effect. Neat pic!!!