Obsidian is volcanic glass that is formed from molten lava cooling extremely quickly. It is a fast working stone for crystal healing. It enhances the truth and is reflective. Both of these properties aid with exposing flaws, weakness, and blockages. When performing self work, there is not a better stone. Obsidian can help vitalize soul purpose and relieve tension. Placing it under your pillow or next to your bed can help draw out mental stress and tension, and can aid with nightmares. Because it is a stone with high emotional absorption, it must be rinsed under water after each use. Other forms of obsidian include Apache Tears or Snowflake Obsidian, which are both gentler workers and can be used more simply for calming.