Appearance: White odorless amorphous powder.

Density: 7.407g/cm ³ The density of Monoclinic crystal system is 8.297g/cm ³

Melting point: 2330 ± 20 ℃ (according to some sources, it is 2420 ℃).

Solubility: insoluble in water, soluble in acids to form corresponding salts. When exposed to the air, it is easy to absorb water and carbon dioxide from the air and deteriorate. It can react with ammonia to form hydrate precipitates of gadolinium.