apatite enhances manifestation of ideas to reality
its associated with the third eye chakra, & can increase psychic abilities, such as clairvoyance and clairaudience.
meditation with apatite can open the third eye chakra to more subtle vibrations. 
enhances communication and self-expression on all levels
encourages openness and ease in social situations
apatite is a good stone for gemini, and acts as a good balancer of energies, emotions, chakras, and subtle bodies, as well as the male and female aspects of the self.