Indium Trifluoride, InF₃

Glistening, colourless, rhombic pyramids of the Indium trihydrate InF₃.3H₂O have been obtained by Thiel, and white needles of the hydrate InF₃.9H₂O have been prepared by Chabrie and Bouchonnet, by the action of dilute hydrofluoric acid on indium hydroxide. The hydrates are sparingly soluble in cold water, and when boiled with water are resolved into indium hydroxide and hydrofluoric acid.

The double salt indium ammonium fluoride is very slightly soluble in water.