Hey that sure is neat, but, I don't think it is a skull either, even though it looks like one. I can not imagine teeth turning into crystal. Also there is no jawbone, yet, it has teeth? Enamel will not turn into crystal. Crystals grow in place of cavities. The eye sockets are uneven and the left side of "it" has the appearance of swelling and deformation. What you have is an attempt, by someone, to make something appear from nothing. The eye sockets are conical in shape and half open from the front to the back. No separable jawbone. Someone had a talented hand and saw something in that rock that no one else did. He/she made something really neat from it. GL
Laater...