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
Zircon syenite, a coarse-grained syenite containing zircon crystals and often also elolite. It is largely developed in Southern Norway.
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Wed 28th October 2020