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From The Collaborative International Dictionary of English v.0.48:
Zircon \Zir"con\, 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]