(so called because it was discovered by Sid Pieters in Namibia) is a mix of blue and gold tiger's eye in quartz which has been folded and stressed in the Earth.  It has the lovely iridescence of tiger's eye but not in structured bands, more in swirls and swathes.

Dorothy Roeder in her book "Crystal Co-Creators", which we think is one of the best books on crystals, says that the Galactic Council of Twelve made Pietersite a specific anchor for a structure of angelic energy to stimulate humanity's use of the divine creative potential in Earth.  Melody in her "Kaleidoscope of Crystals" another of the major books on crystals, tells us Pietersite has been said to contain "the keys to the kingdom of heaven", dispelling illusion and assisting one to recognize the beauty of the soul and helping to support human courage, tenacity and dauntless effort to create and maintain beauty..