Eagle Eye

Eagle Eye Semiprecious Gemstone Beads: It's difficult to find reliable information on Eagle Eye. We've been told it's jasper, but it has hints of translucence that don't normally occur in jaspers. Is it feldspar (like moonstone and labradorite)? Is it a gray form of tigereye? Is it magical Toads Eye (aka toadstone)? Is it Hawk's Eye (the name for an earlier form of tigereye)? Whatever it is, our Eagle Eye beads are striped like tigereye or tiger iron, and these stripes of light and dark gray have a chatoyant shimmer, but don't have the full cat's-eye effect. Many of the stripes are parallel, and some are swirled. It almost certainly is a variety of quartz. If it is simply gray tigereye, then the stripes are oriented fibers of crocidolite (a mineral of the amphibole group) that have been replaced by silica. But it's lacking the iron that commonly gives tigereye its rich warm hues.