Morenci turquoise comes from the Morenci copper mine in Arizona. The story is told in Turquoise in America Part Two, 1910-1990.
 
This cab weighs 10.4 carat and measures 1.75cm X 1.5cm. It is priced at $30 a carat or $312. It is not treated and is backed. I have assigned a TG of 85 or VHG. This is from the Callais Collection. White spot is camera flash.