Turquoise

     Turquoise is formed by the natural alteration of aluminum-bearing surface rocks, with copper derived from weathering of copper sulfides, and phosphates.    
     It is a popular gemstone because of its blue color and delicate veining.  Attempts to synthesize Turquoise have not been successful, but many times mixtures of copper and aluminum phosphates, which are similar in color, are sold as Turquoise.  
     True Turquoise occurs in dense masses, crusts and veinlets, and vary in color from pale blue to blue-green to green.  Minute crystals that are transparent bright blue are rare.

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