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Figure 9
(a) The stacking of the polyhedra in the high-pressure phase of MgSO4·5H2O along the b axis, highlighting the hydrogen bonding between adjacent MgO6 polyhedra, Ow5—H5a⋯Ow4 and Ow5—H5b⋯Ow3. (b) A view of the packing down the a axis, highlighting the hydrogen bonds donated by Ow3. The outline of one unit cell is shown by solid black lines. Symmetry codes: (i) 1 − x, 2 − y, [\textstyle{1\over 2}] + z; (ii) 1 − x, 1 − y, [\textstyle{1\over 2}] + z; (iii) 1 − x, −y, [\textstyle{1\over 2}] + z; (iv) [\textstyle{1\over 2}] − x, [\textstyle{3\over 2}] + y, [\textstyle{1\over 2}] + z; (v) [\textstyle{1\over 2}] − x, [\textstyle{1\over 2}] + y, [\textstyle{1\over 2}] + z; (v) x, 1 + y, z.

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