Obsidian

【Mahogany Obsidian】
Has a gentle energy than black. Resonating with the earth, it grounds and protects gives strength in times of need, vitalizes purpose, eliminates energy blockages, and stimulates growth on all levels. It is stabilizing stone that strengthens a weak aura and restores the correct spin to the sacral and solar plexus chakras. Worn on the body, Mahogany Obsidian relieves pain and improves circulation.

Source: *The Crystal Bible by Judy Hall