Tourmaline is a type of mineral that is found in many different colors, including black, brown, pink, red, blue, green, and even colorless. The most common form of tourmaline is schorl, which is a dark black or brown variety. Schorl is the six-letter answer to the crossword puzzle clue. Tourmaline is a popular gemstone that is used in jewelry and other decorative items. It is also known for its ability to generate an electrical charge when heated or rubbed.