Indigo Kyanite will activate the third eye, whilst the high vibration of the almost sapphire-like blue Kyanite can align all the chakras and, it is said, activate the kundalini.  Kyanite is a very lifting stone, and the longer you keep it within your aura, the more it will elevate the good vibrations in your energy field.  The blue Kanite and turquoise apatite both open the channels of self expression, and messages received, encouraging the communication and delivery of truth.  Apatite is also a great cleansing stone, both physically and emotionally, encouraging release through expression and letting go.