It is actually Howlite.
Natural Howlite Round Bead Strands.Natural Howlite Round Bead Strands, Dyed & Heated, Medium TurquoiseSize: about 8mm diameter, hole: 1mm; about 48pcs/strand, 15.● This stone is from Xinjiang, it is known in the trade as Turquoise because of its blue-green hues(dyed & heated treated), similar to turquoise in appearance.