Extra Small = 0.1 to 0.2 ounce - 5/8 inch to 1 & 1/4 inch long, by 3/8 inch to 3/4 inch wide, by 1/8 inch to 3/4 inch thick.

Small = 0.3 to 0.5 ounce - 7/8 inch to 1 & 1/2 inch long, by 5/8 inch to 1 inch wide, by 1/4 inch to 5/8 inch thick.

Medium = 0.6 to 0.9 ounce - 1 & 1/8 inch to 1 & 1/2 inch long, by 3/4 inch to 1 & 1/8 inch wide, by 3/8 to 7/8 inch thick.

Large = 2 to 3 ounce - 1 & 1/2 inch to 2 & 1/8 inch long, by 1 & 1/8 inch to 1 & 1/2 inch wide, by 7/8 inch to 1 & 1/8 inch thick.

About Apatite:
Apatite is an inspirational stone.  It balances the physical, emotional, mental, & spiritual bodies, as well as chakras, eliminating over activity & stimulating under activity.  It increases motivation & builds up energy reserves.  It stimulates creativity & the intellect. 

Apatite clears confusion & helps to access information to be used personally & for the collective good.  It expands knowledge & truth, & eases sorrow, apathy, & anger.  Apatite also reduces irritability & frustration, & overcomes emotional exhaustion.

Apatite links consciousness with matter, helping to manifest your thoughts into reality.  Apatite also helps to develop psychic gifts & spiritual attunement.  It deepens meditation & raises the kundalini.

Apatite promotes a humanitarian attitude & draws off negativity about oneself & others.  It aids communication & self-expression, inducing openness & social ease.

Physically, Apatite heals bones & encourages the formation of new cells.  It aids absorption of calcium & helps cartilage, bones, teeth, & motor skills.  Apatite relieves arthritis, joint problems, & rickets.  It suppresses hunger & raises the metabolic rate, encouraging healthy eating.  Apatite heals the glands, meridians, & organs & overcomes hypertension.