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The high-pressure room temperature behavior of PbCO 3  was investigated by angle-dispersive synchrotron powder diffraction up to 16.16(5) GPa. A phase transition to a high-pressure polymorph II of lead carbonate was observed at a pressure of approximately  p  c  = 8.7 GPa. Thereby, the symmetry is reduced from orthorhombic  Pmcn  to monoclinic  P 12 1 / c 1. The cell parameters at  p  = 8.90(5) GPa are  a  = 5.101(1) Å,  b  = 8.303(3) Å,  c  = 5.602(2) Å,  β  = 89.51(4)°, Z = 4. The transformation is supposed to be of 2 nd  order.

Evidence for the existence of a PbCO 3 -II phase from high pressure X-ray measurements