Zircon

n.	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.
	2.	an imitation gemstone made of cubic zirconia. Zircon syenite a coarse-grained syenite containing zircon crystals and often also elæolite. It is largely developed in Southern Norway.

Noun

1.

zircon - a common mineral occurring in small crystals; chief source of zirconium; used as a refractory when opaque and as a gem when transparent Synonyms: zirconium silicate

atomic number 40, hyacinth, jacinth, jargon, jargoon, mineral, zirconium, zirconium silicate, Zr