| Ca(ClO4)2·6H2O | Dx = 1.972 Mg m−3 |
| Mr = 347.08 | Mo Kα radiation, λ = 0.71073 Å |
| Orthorhombic, Pca21 | Cell parameters from 17254 reflections |
| a = 10.9603 (4) Å | θ = 2.9–29.6° |
| b = 7.9667 (7) Å | µ = 1.06 mm−1 |
| c = 26.7735 (18) Å | T = 180 K |
| V = 2337.8 (3) Å3 | Plate, colourless |
| Z = 8 | 0.38 × 0.31 × 0.08 mm |
| F(000) = 1424 |