Green Tourmaline on Quartz Matrix - Unique #9 Green tourmaline is prized for its spectacular green colour and rod-like crystal formations. The specimen for sale is a quartz chunk matrix with green tourmaline encrusting the piece with some crystal rod formations. The quartz is fairly white but brittle, thus the stone must be handled with care. This specimen is a nice mix of both types of crystals, showcasing nature’s artistic creations. Note: This product is fragile and should be handled with care.