To some people, a crystal skull is simply a crystal in the shape of a human skull. But to those who believe in the supernatural, it can represent doom or hope.
Information on Crystal Skulls
Crystal Skulls: Ancient Tools for Peace, Knowledge, and Enlightenment - Kindle edition by Hall, Judy. Religion & Spirituality Kindle eBooks @ .
Crystal Skulls: The Benefits, Power, and History– Amethyst Goddess
How are crystals made?
Kingdom of the Quartz Skull - EasyBlog - Bowers Museum
See the British Museum's own Crystal Skull
How to Make a Crystal Skull
Clear Quartz Skull, Gemstone Skulls
Lot - A carved and gem-set rock crystal skull