Geological Properties
Apatite is calcium phosphate combined with fluorine, chlorine or hydroxyl. These three minerals are usually found in every specimen but some specimens have been known to have 100% of one or the other. It is often hard to spot the difference between the three minerals in hand samples of this stone. Apatite has a hardness 5 on the Mohs scale (Mohs).
Metaphysical & Healing Properties
Blue Apatite is considered a stone of manifestation because it connects us to both our past and our future and provides the clarity needed to reach an enlightened state. Blue Apatite is known to increase the power of lucid dreaming and many will keep this stone near them while they sleep. In other words, it can help wearers achieve their dreams and goals.
Cares
Apatite is fragile and very sensitive to chemicals, abrasives, heat, acids, and ammonia. Never use a steamer, hot water or ultrasonic cleaners with this stone. Use mild soap and room temperature tap water with a soft cloth so you do not scratch the surface or diminish the luster of the stone.
References:
https://en.wikipedia.org/wiki/Apatite
https://www.crystalvaults.com/crystal-encyclopedia/apatite-blue
https://www.minerals.net/mineral/apatite.aspx
https://geology.com/minerals/apatite.shtml