Turquoise is a copper aluminium phosphate that varies in colour from blue to blue/green due to the varying content of copper and iron. It can sometimes be found growing with another copper based mineral Chrysocolla and mistaken for this stone. Due to the nature of some forms of this mineral it can sometimes be treated with resins which help to stabilize it, although this treatment can decrease its value.
However a pure form, Sleeping Beauty Turquoise from Arizona is highly sought and has become increasing rare.
Turquoise is said to balance and align the chakras, stabilising mood swings and encouraging calm emotional states.  It is excellent for depression and exhaustion, it also has the power to prevent panic attacks.
Turquoise promotes self-realisation and assists creative problem solving.
In physical healing Turquoise is said to help the body absorb nutrients, calm cramps and neutralise stomach acid.
Turquoise purifies lungs, soothes and clears sore throats, and helps to heal any ailment of the eyes.