Amethyst is a natural tranquilizer, it relieves stress and strain, soothes irritability, balances mood swings, dispels anger, rage, fear and anxiety. Alleviates sadness and grief, and dissolves negativity. Amethyst activates spiritual awareness, opens intuition and enhances psychic abilities. In a birefringent crystal there are 2 polarization directions, perpendicular to each other, that are permissive and that allow light of according polarization to propagate. Light of other polarization is split up into 2 waves of perpendicular polarization and of different refractive index