Maybe its petrified wood or a peice of polished wood, I have posted a link below giving some pictures of pertrified wood
Its properties are Health & Healing Protection. This is ancient wood replaced and hardened by minerals - usually agate and quartz. When polished, it takes on colors ranging from beige to deep brown to vivid reds and oranges. Petrified Wood provides for strength in all areas of one's life and is also an excellent stone for grounding. It can provide support to one coming through a crisis. It provides insight into "why" the suffering has occurred and into the lessons which can be learned. This stone assists one in elevating to one's higher self. On a physical level, it can be used to strengthen the back and to promote alignment to the skeletal structure of the body. Petrified wood helps to release worries. It is a stone of strength and courage. It is used in workings to increase health and lifespan and also to bring understanding and evolution to all lives, past, present and future.