This is the tumbled and polished version of Indigo Obsidian. When you order this item, you will receive a hand-picked specimen from our stock of inventory. Indigo Obsidian can be used for your Third Eye Chakra. Though Black Obsidian is an Earthen-made crystal of volcanic glass, colored obsidians are extremely rare and so most, including this, are man-made. Be that as it may, it can still be used with its chakra-associated color.