Stunning Yellow Apatite with Green and black Tourmaline specimen from Cerro De Mercado mine in Durango Mexico . 
This beauty weighs 536 grams or 1.18 lbs 
5.5 inches long 
A steal of price for this High End specimen
It is said yellow Apatite Enhances focus and concentration - The vibrant solar energy of yellow apatite is known to sharpen the mind and improve concentration.