Green Tourmaline on Quartz Matrix - Unique #14 Quartz is a crystal that grows in many environments and in many forms. The piece for sale is grey with some whiter shades mixed in, giving the piece a unique colour. There are both green tourmaline rods and watermelon tourmaline (green with pink center) crystals growing out of the quartz matrix. This specimen is a unique piece that has fairly rare crystals on it, making it as valuable as it is fascinating. Note: This crystal specimen is brittle/fragile and should be handled with care.