Black Tourmaline Crystal with Mica 4 InchBlack Tourmaline With Mica for Protection This is a natural piece of Black Tourmaline with mica, also known as Schorl. The bottom side is cut to stand upright, with natural and rough sides on the top. Metaphysical Properties Black Tourmaline is considered a protective stone that repels, absorbs, and blocks negative frequencies and energies. By absorbing negativity, this stone can prevent unwanted energy in your home. It is said to purify negative