Calcium Metatungstate, CaW4O13.10H2O, is formed by the action of a hot solution of metatungstic acid on calcium carbonate. It crystallises with difficulty, yielding triclinic pinacoidal crystals,
a:b:c = 1.0070:1:1.3694; α = 91° 1'; β = 93° 0'; γ = 90° 16'. |