Pack of 4. Obsidian is a silica rich volcanic glass that has no regular geometric pattern. Brings good luck! It mirrors & helps eliminate imperfection. Opens the heart & throat centers to help speak ones truth with integrity. Initiates & transforms old ideas and patterns. Dissolves fears & blocked trauma then activates a spiritual shield against attack. Facilitates healing & supports balance, security & safety. Dissolves pain & tension & dramatically improves circulation. Helps night vision. Assists disorders associated with heart & gallbladder.