Splendid Green Prehnite Quartz Heart Bead StringPrice is for 15. 5 inch of these green quartz. Each bead measure 14mm x 15mm x 7mm. All are drilled and ready for stringing. Some of the beads have speck or black rutile which are natural inclusions of quartz. There are about 28 highly polished beads . Quartz is abundant, solidified from volcanic lava and composed of oxygen and silicon. Many other semi precious stones are in the quartz family, producing beads in almost every colour. Quartz crystal was