Ammonium Magnesium Chromate, (NH₄)₂CrO₄,MgCrO₄

Ammonium Magnesium Chromate, (NH₄)₂CrO₄.MgCrO₄.6H₂O, crystallises in large monoclinic prisms isomorphous with the corresponding double sulphate. The dihydrate has been precipitated in yellow crystals, which are stable in water, by adding a 2N solution of MgCrO₄ to a 2N solution of (NH₄)₂CrO₄.