The iron eye is composed of silicon, SiO2 + iron sesquioxide Fe2O3-. Its crystal system is rhombohedral. Its colors are a layered aggregate of red jasper, ferrous oxide (magnetite, hematite) metallic gray and black as well as golden-brown yellow tiger's eye.
The benefits : Strength, boldness, energy.
Astrological signs : Aries, Taurus, Scorpio.
Chakra : Root.