Blue Dumortierite is a stone that teaches you to stand up for yourself.  It will help you to take control of your own life and increase your level of patience.  This dark blue crystal, has a strong ability to aid intellectual activity within the brain, and will assist you to develop enhanced mental abilities. Dumortierite is a highly useful aid for anyone who is studying, as it assists the retention of information, as well as enhancing your will power. Natural crystals of Dumortierite have a strong frequency that may assist you to hear the voice of the Divine.