Black tourmaline is a master crystal of protection. Black tourmaline, also known as Schorl, is extremely grounding by nature and helps neutralize one's internal energy from negative to positive. Black in color and has a hardness of 7 to 7.5 on the Mohs scale. It's very common for black tourmaline crystal to be fractal in shape and nature. If you are feeling unsafe, unbalanced - black tourmaline is a great crystal to keep on your person and excellent for work place environment as it protects against toxic and negative energy. This set includes: 3 Medium Black Tourmaline Chunks ranging from .75 - 1.25 inches 1 Recycled Cotton Muslin Keepsake Mothball Memoirs Bag Price is firm.