zirconia

Cones of zirconia are also used in the same way; or a thorium mantle in conjunction with alcohol vapour may be employed.

I endeavored repeatedly to fuse zirconia, placing it in a cup or arc light carbon as indicated in Fig. 23.

The sample submitted, like this in your hat, was zirconia; the earth-ore which carries the rare metal zirconium.

Microcosmic salt does not dissolve so much zirconia as glucina, and is more prone to give a turbid bead.

Zirconia yields with nitrate of cobalt, when ignited, an infusible black mass.