Moqui marbles (also known as shaman stones or thunderballs) are a completely natural formation. They are a compact sandstone balls with a metal crust. This outer shell contains a high iron (hematite) and other heavy metal content. Little is known about these stones and how they are formed. What scientists do know is this heavy metal shell displays a much higher metal content than is available in the surrounding environment. Most of them come from the Navajo Sandstone Formation in the state of Utah. Boji stones are created by humans from stones that were crumbling and dying. These stones have been infused with channeled energy and chemical (alchemy) processes.