[1] The rare-earth mixture didymium, previously believed to be an element, partially consists of neodymium(III) oxide.

[3] Neodymium-doped glass turns purple due to the absorbance of yellow and green light, and is used in welding goggles.

One kind of glass named for the mineral alexandrite appears blue in sunlight and red in artificial light.

[5] About 7000 tonnes of neodymium(III) oxide are produced worldwide each year.

[6] Neodymium(III) oxide has a low-temperature trigonal A form in space group P3m1.