Morenci is an iconic turquoise mine considered of of the Big Three of Arizona. The history is found in Turquoise in America Part Two 1910-1990.
 
This cabochon weighs 13.7 carats and measures 2cm X 1.5cm. It is priced at $70 a carat or $959. It is not treated and backed. I have assigned a TG of 91 or GG. I purchased this from Brown Trading Post from the collection of Bill Brown.