This stone acts as an aid to your mental capabilities in overcoming tough situations. It opens the third eye chakra to enhance mental (and emotional) intelligence.
Dumortierite promotes mental discipline especially in regard to learning new things. Students find it useful when they are required to take in large amounts of data over short periods of time, because it aids memory.
Meditate or sleep with dumortierite to stimulate psychic or prophetic vision if you are gifted.