Chromic Thioarsenite, 2Cr₂S₃.3AsS₃

Chromic Thioarsenite, 2Cr₂S₃.3AsS₃, and chromic thioarsenate have been described by Berzelius.

By allowing solutions containing molecular proportions of alkali arsenate and chromic oxide, or of arsenic pentoxide and alkali chromate or dichromate, to crystallise, the following complex salts have been obtained:

2K₂O.As₂O₅.4CrO₃.H₂O;
2(NH₄)₂0.As₂O₅.4CrO₃.H₂O;
3(NH₄)₂0.As₂O₅.8CrO₃.H₂O.