| Noun | 1. | zirconium silicate - a common mineral occurring in small crystals; chief source of zirconium; used as a refractory when opaque and as a gem when transparentatomic number 40, zirconium, Zr - a lustrous gray strong metallic element resembling titanium; it is used in nuclear reactors as a neutron absorber; it occurs in baddeleyite but is obtained chiefly from zircon mineral - solid homogeneous inorganic substances occurring in nature having a definite chemical composition jargoon, jargon - a colorless (or pale yellow or smoky) variety of zircon | |