I feel psychic protection. Black obsidian is a great stone for protection. It helps to protect you from psychic attacks and helps to keep you grounded. Associated with the root chakra. Black obsidian is a silica rich volcanic mineral with a hardness of 5.5. Price per piece. Average size-12.5 cm or 5 inches Crystals are a natural product. Sizes and colours vary. Inclusions are a natural part of any crystal. You will receive a crystal similar to shape and colour shown. Each are unique and special and should be celebrated. Just as you should celebrate yourself. Crystal Healing is not meant to replace conventional medicine, but rather to complement and enhance it. Information within this site is metaphysical in nature and is by no means medical. ls should only be used with the understanding that they are not an independent therapy, but rather are just part of a holistic healing approach to wellness.