Crystal Quartz Star Tetrahedron Plato equated the Tetrahedron with the element fire. Tetrahedron (Solar Plexus Chakra) Its size is 29.5mm X 25.5mm Crystals are an extremely powerful healing and energy amplifying tool. They have the ability to absorb, store and release energy, information, light and vibrations. Quartz is a power stone. It has been called the "Universal Crystal" because of its many uses. It enhances energy by absorbing, storing, amplifying, balancing, focusing and transmitting. Quartz is a stone of clarity which dispels negativity and clears away negative energy. It can be used to purify and clarify on the spiritual, mental, and physical planes.