Obsidian is a naturally occuring volcanic glass. With it's glossy texture it has been referred to as a 'mirror stone'. Physically we can see our reflection yet on a deeper level our deeper being may be revealed to ourselves. Obsidian is used for revealing our darker side, allowing us to become more self reflective and do shadow work which concerns healing our fears and weaknesses.
Obsidian is stone that offers us protection and grounding on whilst we become more honest and vulnerable with ourselves so that we can change and grow in an authentic and healthy way.
According to Native American teachings, Black Obsidian is compared to the Great Void or the Great Mystery from which all things are created, and is considered a stone for spiritual dreaming and initiation. [Lembo, 234]