Phantom quartz is a type of quartz crystal which exhibits an unusual property in that it can be seen in both transmitted and reflected light. It has the appearance of two stones, one displaying the exterior profile of the crystals face and the other showing its interior, like an optical illusion. Phantom quartz crystals are very rare because they form at high temperatures and pressures in microcrystalline rock formations. They are also called “one-way stones”.
Spiritually, phantom quartz is said to be a good luck stone with mystical properties. It is believed to keep away bad spirits, bring peace to children who have tantrums or seem nervous or overly sensitive, or provide protection to travelers journeying over water.