Black Tourmaline, which is also known as Schorl, is an iron-rich complex borosilicate. It is opaque black and is very common. Black tourmaline can be electrically charged by heating or rubbing it, which results in one end becoming positive and the other negative. Black tourmaline is one of the main crystals for protection against negativity. It is said to guard against radiation and environmental pollutants as well as giving psychic protection in challenging places or situati
