Caesium Chromate, Cs₂CrO₄

Caesium Chromate, Cs₂CrO₄, obtained by interaction of silver chromate and caesium chloride in boiling aqueous solution, is yellow in colour, and exists in two crystalline forms - rhombic (bipyramidal):

a:b:c = 0.5640:1:0.7577;

and rhombohedral:

a:c = 1:1.2314; α = 72° 39'.

It forms a double salt, Cs₂Mg(CrO₄)₂.6H₂O, isomorphous with the corresponding rubidium salt.