a tundra that is treeless because of high elevation rather than high latitude.
- Zirconium oxide
Chemistry. a white, heavy, amorphous, odorless and tasteless, infusible, water-insoluble powder, ZrO 2 , used chiefly as a pigment for paints, an abrasive, and in the manufacture of refractory crucibles. noun a white amorphous powder that is insoluble in water and highly refractory, used as a pigment for paints, a catalyst, and an abrasive. Formula: […]
a metallic element found combined in , baddeleyite, etc., resembling titanium chemically: used in steel metallurgy, as a scavenger, as a refractory, and as an opacifier in vitreous enamels. Symbol: Zr; atomic weight: 91.22; atomic number: 40; specific gravity: 6.49 at 20°C. Contemporary Examples The other source of vector is the reaction between the zirconium […]
a common mineral, silicate, ZrSiO 4 , occurring in small tetragonal crystals or grains of various colors, usually opaque: used as a refractory when opaque and as a gem when transparent. Historical Examples “Possibly you were yelling so loud yourselves you didn’t hear us,” zircon said mildly. The Caves of Fear John Blaine zircon, engrossed […]
containing the group ZrO=, as zirconyl bromide, ZrOBr 2 .