In 1843 Mosander discovered terbium and erbium as components of yttria. These oxides are commonly called "zirconia" (ZrO) and "yttria" (YO), hence the name. Klaproth preferred the name "beryllina" due to the fact that yttria also formed sweet salts. The yttria/magnesia binary system is an ideal model system for nanocomposite formation. GE's transparent Yttralox was followed by GTE's lanthana-doped yttria with similar level of additive. Anders Gustaf Ekeberg confirmed the identification in 1797 and named the new oxide "yttria". A major consideration is the low emissivity of yttria, which limits background radiation upon heating. In the following decades, seven other new metals were discovered in "Gadolin's yttria". A good example is yttrium(III) oxide (), also known as yttria, a six-coordinate white solid. Yttriaite-(Y), approved as a new mineral species in 2010, is the natural form of yttria. Yttria stabilizes the cubic form of zirconia in jewelry. Yttria is used as a sintering additive in the production of porous silicon nitride.