GNU Collaborative International Dictionary of English

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1.       
   Zircon (?), n. [F., the same word as jargon.  See Jargon a variety of zircon.]
   1. (Min.) A mineral consisting predominantly of zirconium silicate (Zr2SiO4) occurring in tetragonal crystals, usually of a brown or gray color. It consists of silica and zirconia.  A red variety, used as a gem, is called hyacinth. Colorless, pale-yellow or smoky-brown varieties from Ceylon are called jargon.
   
   [1913 Webster +PJC]
   
   
   2. an imitation gemstone made of cubic zirconia.
   
   [PJC]
   
   Zircon syenite, a coarse-grained syenite containing zircon crystals and often also elaeolite. It is largely developed in Southern Norway.
   
   [1913 Webster]