In chemistry, antimonite refers to a salt of antimony(III), such as and (meta-antimonite), which can be prepared by reacting alkali with antimony trioxide, .Egon Wiberg, Arnold Frederick Holleman (2001) Inorganic Chemistry, Elsevier These are formally salts of antimonous acid, , whose existence in solution is dubious. Attempts to isolate it generally form , antimony(III) oxide hydrate, which slowly transforms into .
In geology, the mineral stibnite, , is sometimes called antimonite.
Antimonites can be compared to antimonates, which contain antimony in the +5 oxidation state.
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