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The kieserite-type compound cobalt(II) sulfate monohydrate, CoSO 4 ·H 2 O, has been investigated under isothermal ( T  = 295 K) hydrostatic compression up to 10.1 GPa in a diamond anvil cell by means of single-crystal X-ray diffraction and Raman spectroscopy. The monoclinic α-phase (space group  C 2/ c ) undergoes a second-order ferroelastic phase transition at  Pc    = 2.40(3) GPa to a triclinic β-phase (space group  P1   ‾$&amp;#x203e;{1}$). Lattice elasticities derived from fitting third-order Birch-Murnaghan equations of state to the pressure dependent unit-cell volume data yield  V   0  = 354.20(6) Å 3 ,  K   0  = 53.0(1.7) GPa,  K ′ = 5.7(1.8) for the α-phase and  V   0  = 355.9(8) Å 3 ,  K   0  = 45.2(2.6) GPa,  K ′ = 6.6(6) for the β-phase. Crystal structure data of the high-pressure polymorph were determined at 2.98(6) and 4.88(6) GPa. The most obvious structural feature and thus a possible driving mechanism of the phase transition, is a partial rearrangement in the hydrogen bonding system. However, a comparative analysis of pressure-induced changes in the four kieserite-type compounds investigated to date suggests that the loss of the point symmetry 2 at the otherwise rather rigid SO 4  tetrahedron, allowing symmetrically unrestricted tetrahedral rotations and edge tiltings in the β-phase, could be the actual driving mechanism of the phase transition.

CoSO 4 ·H 2 O and its continuous transition compared to the compression properties of isostructural kieserite-type polymorphs