Neodymium(III) carbonate is an inorganic compound, a salt, where neodymium is in the +3 oxidation state and the carbonate ion has charge -2.

The anhydrous form is purple-red,[2] while the octahydrate is a pink solid.

[6] It can also form compounds with hydrazine, such as Nd2(CO3)3·12N2H4·4H2O which is a transparaent crystal that is slightly soluble in water but insoluble in benzene, d20°C = 1.96 g/cm3.

[7] Neodymium(III) carbonate forms crystals and has a crystalline hydrate composition of Nd2(CO3)3·n H2O, where n = 2.5 and 8.

[3] Neodymium carbonate can be used for lasers, glass coloring and tinting, and dielectrics.