Gadolinium nitrate, Gd(NO₃)₃

Gadolinium nitrate, Gd(NO₃)₃.6H₂O, separates from aqueous solution in large, triclinic crystals of density 2.33, and melts at 91°. From concentrated nitric acid the pentahydrate, Gd(NO₃)₃.5H₂O, crystallises out in prisms of density 2.41. Of all the rare earth nitrates, this salt is the least soluble in nitric acid. It melts at 92°.

Gadolinium ammonium nitrate, Gd(NO₃)₃.2(NH₄)NO₃.xH₂O, is an extremely soluble, deliquescent salt.