Zircon

['zɜːk(ə)n] or ['zɝkɑn]

Definition

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

Edited by Dinah--From WordNet

Definition

(n.) 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.

Edited by Elena