could of just put the link. photo's kind of dark, kind of looks like moonstone, but cracked or have some other mineral running through it. could just be the lighting though. mind you i'm no stone expert so it could [and probably is] something else. clear quartz perhaps.
i like moonstone myself, it's associated with the third eye chakra, has magical properties over intuition, inner harmony, balance, calming, lucid dreams, enhances psychic abilities and protection in travel.