This is a natural piece of Black Tourmaline, also known as Schorl. The bottom side is cut so it stands upright, with natural and rough sides and on the top.
Black Tourmaline is thought of as a protective stone which repels, absorbs, and blocks negative frequencies and energys. Through absorbing negativity, this stone can prevent unwanted energy in your home. It is said to purify negative feelings and thoughts and it encourages a positive attitude regardless of what the circumstances may could be. It is also a powerful grounding stone and can help with balancing your many responsibilites, like work\life balance.
Measurments are approximately: This piece is 5 inches in height & 2.75 inches in width.