Mahogany Obsidian: Said to be a very grounding. Said to clear energy blockages, provide protection from negative energy, encourages spiritual growth. 

Obsidian: Said to be very cleansing and grounding. Said to eliminate negative energies, help one remained centered in the face of negativity, and recognize the source of negative emotional patterns.

Matte Onyx: Said to be a very strong protection stone. Said to take negative energy and transform it into physical strength. Said to prevent the draining of your own energy.