Stunning Yellow Apatite In Quartz  specimen from Cerro De Mercado mine in Durango Mexico . 
This beauty weighs 916 grams or 2  lbs 
6.5 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.