I was wondering that too, it is either given away in your sig pic or it is not nice to post ones ignorance in public, i am still not sure if i have it right, the milky way (OK now everyone knows how daft i am ), really very impressive shot.
it does look a lot like the milky way or some other astronomical scene but its just a rock.
This rock specifically:
If it makes you guys feel any better it has a fancy name, it is a quartz biotite schist. The black grains of mica have been arranged in rows by extreme heat and pressure. Thanks again guys.