Turquoise is an opaque, blue-to-green mineral that is a hydrated phosphate of copper and aluminium, with the chemical formula CuAl6(PO4)4(OH) 4H2O. It is rare and valuable in finer grades and has been prized as a gemstone and ornamental stone for thousands of years owing to its unique hue. Are you looking for Tourquise Stone Beads line? Place an order today for Tourquise Stone Beads line at low price at Crystal Export.