Your piece will be (if not the exact picture) quite similar!
Obsidian is a stone of truth, protection, integrity, honesty and grounding. This stone awakens the inner warrior and provides courage to enter our subconscious mind and rediscover our hidden abilities. Obsidian, in general, protects our mind from all sorts of negative energies. Because of its reflective, mirror-like surface, Obsidian works like a mirror in which we can clearly see our own mistakes and weaknesses. Moreover, this stone will provide assistance and insight into the possible ways of correcting those mistakes. Obsidian is also believed to block the geopathogenic radiation.
Please see our Crystal Lore Section for more info on this amazing stone!