Calcium Trimolybdate, CaMo₃O₁₀.6H₂O

Calcium Trimolybdate, CaMo₃O₁₀.6H₂O, is prepared by boiling an aqueous suspension of calcium carbonate with excess of molybdic acid, and allowing the filtrate to evaporate. Silky needle-shaped crystals separate which dissolve readily in hot water.

Calcium ammonium paramolybdate, to which the formula Ca(NH₄)₃H₅[H₂(MoO₄)₆].9H₂O has been given, separates in white needles when ammonium paramolybdate solution is treated with calcium chloride.