a white crystalline oxide; used in refractories and in insulation and abrasives and enamels and glazes
"The ceramic manufacturer selected zirconia for its high-temperature crucibles because the white crystalline oxide provides exceptional durability as both an insulator and abrasive."
The oxide of zirconium, obtained as a white powder, and possessing both acid and basic properties. On account of its infusibility, and brilliant luminosity when incandescent, it is used as an ingredient of sticks for the Drummond light.
"The chemist mixed the white zirconia powder into the stick mixture to ensure the lamp would glow brilliantly without melting during use."