zircon Meaning, Definition & Usage

  1. noun a common mineral occurring in small crystals; chief source of zirconium; used as a refractory when opaque and as a gem when transparent
    zirconium silicate.

WordNet

Zir"con noun
Etymology
F., the same word as jargon. See Jargon a variety of zircon.
Definitions
  1. (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.

Webster 1913