These obsidian towers are amazing . They have the moon phases etched in them. These measure around 5 inches.  
Black Obs
Keywords: Cleanse, Protection, ProphecyElement: FirePlanet: Saturn/PlutoObsidian is formed by the quick cooling of volcanic lava in an earthly and scientific way that causes it to harden like glass. It has been around since the beginning of time and has been used in trading by the Mayans since 100 B.C. Black Obsidian Stone is a powerful cleanser of psychic smog created within your aura, and is a strong psychic protection stone. This stone has powerful metaphysical properties that will help to shield you against negativity. The energy of these stones may stimulate the gift of prophecy.