A very well established stone of protection, grounding, and repulsion of negative energy. Obsidian is used to bring harbored negativity from within to the surface so that it may be addressed & released. Unresolved emotional trauma, fears, and insecurities are all able to be addressed with more resolve as well.
Obsidian was polished and used as mirrors for a long time before the kind we now use was more easily able to be made. Some still use this black mirror as a way to gain insight into the spirit world or as a conduit for visualization.
This volcanic glass can serve many purposes, but you'll most often hear it recommended to be used to keep darkness & negativity at bay, help you process & release that which you've generated yourself, and to strengthen your connection to your physical body and your presence on this planet.
*Suggested meanings & representations are spiritual in origin and not suggested to replace medical therapy