Blue Apatite has a very uplifting energy, helping one gain a higher perspective on situations. This helps one avoid becoming embroiled in lower emotional responses to situations, especially power plays and manipulations. 
It gives a lot of insight into situations, allowing us to finally understand the root of a problem and so it is a great stone to meditate with of you are experiencing problematic situations particularly  with regard to communication with others. 
It is also an excellent stone for psychic activation, astral travel, lucid dreaming and access to past lives. 
Use as an offering to connect with blue entities, such as spirit guides, angels or beings such as Krishna.