It is actually Howlite.
55 inch.Natural Howlite Heishi Beads Strands, Flat Round/Disc, Dyed & Heated, TurquoiseSize: about 6mm diameter, 3mm thick, hole: 1mm; about 129pcs/strand, 15. Natural Howlite Heishi Beads Strands.● This stone is from Xinjiang, it is known in the trade as Turquoise because of its blue-green hues(dyed treated), similar to turquoise in appearance.