Filter the mind... Unproductive patterns of thought and action are recognized with the help of Snowflake Obsidian (with white flecks). Black Obsidian (solid black) keeps those negative vibes out of your area. Amazonite (green) filters both unnecessary thoughts from your mind as well as the electromagnetic waves from our cell phones and other electronics that penetrate our energy field and slowly sap us. More detailed information is available in the crystal section of my website. This one is 8 1/2".