Moonstone is the best known gem variety of orthoclase feldspar. It is usually polished as a cabochon. Its importance as a gemstone arises because of adularescence, a floating light effect and sheen, compared to the light of the moon. This phenomena results from alternating layers of two kinds of feldspar,which cause light to scatter. Moonstone specimens commonly exhibit chatoyancy (a mobile, wavering striped reflection), and sometimes display a strong cat's eye. 

Colour : Most desirable colour of moonstone is blue, but it also occurs in grey, white, pink, green and brown. 
Hardness : 6-6.5 

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Moonstone is a stone of feminine power and mystery. It assists in journeying inwardly and finding hidden truths in our unconscious and in past lives. It enhances intuition and encourages the wisdom and patience to trust Divine timing.