Ammonium Orthothiovanadate, (NH₄)₃VS₄

Ammonium Orthothiovanadate, (NH₄)₃VS₄, is obtained in rhombic crystals by the action of ammonium hydrosulphide on potassium metavanadate or sodium pyrovanadate solution. It also separates out slowly from an ice-cold saturated solution of ammonium metavanadate in concentrated ammonium hydroxide which has been previously treated with hydrogen sulphide.