Apatite:

Apatite enhances manifestation of ideas to reality and facilitates getting results, and has traditionally been associated with humanitarian efforts and teaching. As a Third-Eye Chakra Crystal, Apatite can initiate or increase the development of psychic abilities, such as clairvoyance and clairaudience. Meditation with an Apatite Crystal on the Third-Eye Chakra can open this chakra up to more subtle vibrations. Apatite is also known for bringing clarity of mind and expansion of insights, and is especially helpful when diligent study is needed to uncover the truth.

Also a powerful Throat Chakra stone, Apatite enhances communication and self-expression on all levels, making this a great stone for teachers. Apatite encourages openness and ease in social situations, a quality that makes it especially useful for autistic children. 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.