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It has hardness of 5 - 6 Mohs. It is formed of hydrous copper aluminum phosphate and its specific gravity is 2.6 - 2.8.
Ancient and yet always at the height of current fashion: that is Turquoise for you. Its brilliant sky-blue belongs to the all-time favourite trend colours in the world  of fashion and jewellery.It has been uncovered that why Turquoises change their colour, the colour change is rather the influence of light, cosmetic products, dust or even the ph-value of the skin, which may all trigger off chemical responses. It is available in sky blue; greenish blue.
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