CaCO3 crystallizes in the orthorhombic Pmmn space group. Ca(1) is bonded in a 8-coordinate geometry to four equivalent O(1) and four equivalent O(2) atoms. C(1) is bonded in a trigonal planar geometry to one O(2) and two equivalent O(1) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to two equivalent Ca(1) and one C(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to four equivalent Ca(1) and one C(1) atom.
CaCO3 crystallizes in the orthorhombic Pmmn space group. Ca(1) is bonded in a 8-coordinate geometry to four equivalent O(1) and four equivalent O(2) atoms. There are two shorter (2.47 Å) and two longer (2.64 Å) Ca(1)-O(1) bond lengths. There are two shorter (2.50 Å) and two longer (2.87 Å) Ca(1)-O(2) bond lengths. C(1) is bonded in a trigonal planar geometry to one O(2) and two equivalent O(1) atoms. The C(1)-O(2) bond length is 1.31 Å. Both C(1)-O(1) bond lengths are 1.29 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to two equivalent Ca(1) and one C(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to four equivalent Ca(1) and one C(1) atom.