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