Occurrence
Holmium oxide occurs in trace amounts in the minerals gadolinite, monazite, and in other rare-earth minerals. Holmium metal readily oxidizes in air; therefore presence of holmium in nature is synonymous with that of holmia. With the abundance of 1.4 mg/kg, holmium is the 56th most abundant element. The main mining areas are China, United States, Brazil, India, Sri Lanka and Australia with reserves of holmium oxide estimated as 400,000 tonnes.
Read more about this topic: Holmium(III) Oxide
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