Quartz is one of the most abundant minerals on Earth. Including agate, chalcedony, onyx, jasper and many other major varieties, quartz has a crystalline structure. Pure quartz is colorless or white. Our selection of opal quartz beads is nearly colorless with an opalescent shimmer. FusionBeads.com offers opal quartz beads in a range of round sizes, shapes, donuts and chips. All of FusionBeads.com's gemstone beads are graded AB. Learn all about gemstones in our Gemstone Q and A.