Tourmalinated Quartz is clear rock crystal (crystal quartz) which has grown together with black tourmaline, and shows strands of the tourmaline running through the quartz, hence "tourmalinated."
Black Tourmaline purifies one’s energy. Often worn as a stone of protection. When combined with Clear Quartz, which amplifies energies focused through it, this gemstone combination becomes a powerful ally in dispelling negative energy. Tourmalinated quartz is thought to provide a balancing of yin/yang energies and release negative patterns.