Neodymium(III) sulfate

It forms multiple hydrates, the octa-, penta-, and the dihydrate, which the octahydrate is the most common.

This compound has a retrograde solubility, unlike other compounds, its solubility decreases with increasing temperature.

[3] This compound is used in glass for extremely powerful lasers.

Neodymium sulfate is produced by dissolving neodymium(III) oxide in sulfuric acid: It can also be prepared by the reaction of neodymium(III) perchlorate and sodium sulfate.

The dihydrate dehydrates to the anhydrous form at 290 °C.

Several dozen pink, similar-sized rectangular crystals
NFPA 704 four-colored diamond Health 1: Exposure would cause irritation but only minor residual injury. E.g. turpentine Flammability 0: Will not burn. E.g. water Instability 1: Normally stable, but can become unstable at elevated temperatures and pressures. E.g. calcium Special hazards (white): no code