Obsidian is a very protective stone, and is excellent for removing negativity. It is also excellent protection against psychic attacks. In particular obsidian protects the gentle from abuse. It is a very grounding stone, and very healing. Physically it benefits the stomach, intestines, muscle tissue, and can rid one of bacterial or viral infections. It sharpens and focuses internal and external vision, and helps get in touch with buried issues before they explode. Obsidian is related to the root chakra.