Zir"con (?), n. [F., the same word as jargon. See Jargon a variety of zircon.] Min.
A mineral 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.
<-- 2. an imitation gemstone made of cubic zirconia. -->
Zircon syenite, a coarse-grained syenite containing zircon crystals and often also elaeolite. It is largely developed in Southern Norway.
© Webster 1913.