Mahogany obsidian is good for opening and clearing the base and sacral chakras. It releases negativity that keeps one stuck and unable to move forward from repeated patterns of abuse, negativity, hatred and fear. On a physical level, it helps the body to discharge poisons by fortify kidney and liver functions.
Obsidian is a naturally occurring volcanic glass that is created when lava flows are quickly cooled with water. Obsidian is comprised mostly of silicon dioxide but its amorphous formation lacks the crystalline structure of quartz and is therefore generally softer. This beautiful mineral is perfect for carving and polishing and has long been used in ceremonies and cleaved into weapons.
The energy of obsidian is softer than smoky quartz that has a lovely grounding energy. Its energy is highly protective and when placed by the front door will help keep negativity at bay. Black obsidian can also help to keep night mares and terrors at bay.
Using it personally, you are able to work through karmic issues, make sure you are truly ready to deal with them as Obsidian is very to the point one might say. Many use this stone for protection and it can be used to remove negative energy from the body. In elixir form it balances the mental and emotional sides. It is also good as an anti-virus and anti-inflammation and helps to reduce general pain. Leaving a chunk of Obsidian by the door ensures visitors' baggage remains outside your abode.