Black Tourmaline is part of the Tourmaline family. It is also known as Schorl and is a style of silicate crystal. It is commonly found in trigonal crystal systems and is made up of Sodium Iron Aluminum Borate Silicate.

Use Black Tourmaline to protect against electromagnetic "smog" (i.e. cell phones, computers, etc), radiation, noise sensitivity and other such disturbances.

Black Tourmaline can be used as an aid to remove fear and boost self-confidence. A popular metaphysical stone, Black Tourmaline is also great for grounding. It balances, harmonizes, and protects all of the Chakras. 

It acts as a shield to protect you from negative energy.

Small: Approx 2-3 inches
Medium: Approx 3-5 inches
Large: Approx 5-7 inches

Hardness: 7-7.5
Vibration Number: 3 + 4