oval stones with swirling design, 16" long....A member of the quartz group, tiger eye stone is actually a type of blue asbestos and silica that is naturally found in quartz. This gemstone is usually cut out of metamorphic rock and has a silky luster. It is usually found to have colors of red-brown to gold; if the gemstone has not completely silicified, it makes a rarer blue color, called Hawk’s eye.