Red tiger eye is a gemstone closely related to the well known gold tiger eye. In the gold variety, crocidolite is replaced by quartz while its fibrous structure is preserved. The shimmering eye-like nature, called chatoyancy, is caused by these newly created fibers. In this red variety, the colour has been created through a gentle heat treatment. As a healing stone, in addition to the usual properties of gold tiger eye, red is thought to provide motivation and stimulation.