Tourmalinated Quartz is clear rock crystal (clear quartz) which has grown together with black tourmaline, and shows strands of the tourmaline running through the quartz, hence "tourmalinated." The earliest use of tourmalinated quartz was for tools made in Ethiopia over 2 million years ago.
Tourmalinated quartz is believed to protect the wearer from negative thoughts and emotions. It is said to be filled with energy that flashes through it and connects one with other fields of energy. Tourmalinated quartz is thought to provide a balancing of yin/yang energies and release negative patterns. It is used by some to treat disorders of the digestive tract and to detoxify the body.