linguistic:translation, structural:scholar_edition
Enneahydrate

The enneahydrate MgSO · 9H O was identified and characterized only recently, even though it seems easy to produce (by cooling a solution of MgSO and sodium sulfate Na SO in suitable proportions).

The structure is monoclinic, with unit-cell parameters at 250 K: a = 0.675 nm, b = 1.195 nm, c = 1.465 nm, β = 95.1°, V = 1.177 nm with Z = 4. The most probable space group is P21/c. Magnesium selenate also forms an enneahydrate MgSeO · 9H O, but with a different crystal structure.