In addition, rubidium reacts violently with halogens and burns:[1] Rubidium iodide forms colorless crystals, and has a red-violet flame color.

[3] It is easily soluble in water, liquid ammonia, sulfuric acid, RbI·6NH3 and RbI·3SO2.

[3] Rubidium iodide is used as a component of eye drops, in which it is sold in Romania under the name Rubjovit® (containing 8 mg/ml RbI).

However, there are studies that show that rubidium iodide has allergy-triggering[7] and inflammation-causing[8] side effects.

[9] It found isolated use in organic synthesis, for example for the targeted saponification of a polymethylated phosphate.