Each tumbled and polished gemstone is approximately 12-24 mm.   Listing is for 1 tumble.
 
Blue Apatite properties include:
Helps manifestation & deepens meditation
Improve the connection between past & future lives
Develop psychic gifts & spiritual attunement
Helps with openness & social ease
Expands knowledge & truth
 
Chakra: Third Eye, Throat
Zodiac: Gemini, Capricorn, Libra
Element: Air
Planet: Jupiter