Edgar Cayce The Magic Properties of Minerals, Metals and Stones Author and energy healer Dr. Shelley Kaehr discussed her work into the therapeutic properties of minerals, metals and stones. A long time member of Edgar Cayce's A.R.E. (Association for Research and Enlightenment), she also shared Cayce's extensive work in this area, which he delivered during his trance readings. Cayce believed that gems and metals generate a vibrational frequency, and Kaehr explained that by bringing these objects into your range they could attract certain energies which could be healing.