Super X is a famous turquoise mine in Lander County Nevada. The story is told in Turquoise in America Part Two.
 
This cabochon weighs 21.2 carat and measures 3cm X 1.5cm X 5mm. The price is $80/ct or $1696. It is not treated and is backed. I have assigned a TG of 84 or HG. I purchased this stone from Bob and Dixie Edgar. White spot is camera flash.