Holmium(III) oxide: Difference between revisions

Holmium oxide occurs in trace amounts in the minerals [[gadolinite]], [[monazite]], and in other rare-earth [[mineral]]s. Holmium metal readily oxidizes in air; therefore presence of holmium in nature is synonymous with that of holmia. WithHolmium thehas an abundance of 1.4&nbsp;mg/kg, holmium is the 56th most abundant element.<ref name=history/> The main mining areas are [[China]], [[United States]], [[Brazil]], [[India]], [[Sri Lanka]] and [[Australia]] with reserves of holmium oxide estimated as 400,000 tonnes.<ref name=history/>