December--Turquoise
Phosphate of Aluminum
Turquoise is one of the oldest used gems.  The Queen of the Pharoh of the first dynasty of Egypt wore turquoise.  There are sometimes dark lines of limonite throughout the stones.  In early times these stones were considered undesirable.  Today, however, the dark lines add to the beauty of the gem.  Turquoise is a crytocrystalline.
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