Turquoise is very porous and opaque stone that ranges from sky blue, blue-green to apple green. It is a hydrous phosphate of aluminium and copper, with a hardness of 5 – 6 and a triclinic crystalline structure. The pure blue color is very rare, and traces of iron make it greener in color. It strengthens the desire to be Earth. It also strengthens your awareness of the interconnectedness of all life and is useful if you are feeling separate from others or from the natural world around you.