Blue Apatite is a stone of manifestation attuned to the future, activating psychic abilities and allowing expansion of knowledge. Apatite will stimulate the intellect and brings ideas from the mind down into the earth realm through realizations. ... Apatite has been known to also successfully suppress hunger. 
 
Blue Apatite encourages the formation of new cells and aids in the absorption of calcium. It helps heal bones and teeth, repairs cartilage, and is useful in the treatments for rickets, joint problems, arthritis, and motor skills. Blue Apatite may be used to soothe headaches and help with vertigo or dizziness.
Apatite can be placed under the pillow (in in a pillow case to stop it from escaping) and used as a dream stone to connect with your subconscious while sleeping. It can also clarify any hard to understand dreams you may be having.