Quartz was the most popular medium from skulls found in ancient times, but today we find skulls in a variety of crystals like Aquamarine, Fluorite, Rhodonite and Ruby Zoisite. Skulls are intricately carved by stone sculptors using diamond bits on a single piece of healing crystal. They can represent the human or extraterrestrial alien skull. Skulls aid in channeling work and connecting one with the spiritual realms, passed loved ones, the Other Side, and communicating with alien races. They aid in relieving the fear of death. For a very powerful spiritual energy, focus on a single skull surrounded by a circle of smaller skulls in a crystal healing grid.