Table 5.

The Carbonate Anions and Their Environments Ca₂Na₂(CO₃)₃

Atoms	Distance. Å, or angle deg.
C(l), O(1)	1.273(3) Å
C(l), O(2, 2I)	1.286(2)
O(1), O(2, 2I)	2.211(2)
O(2), O(2I)	2.238(2)
O(1), C(1), O(2, 2I)	119.6(1)°
O(2), C(1), O(2I)	120.9(2)
C(2), O(3)	1.306(4) Å
C(2), O(4, 4I)	1.273(3)
C(3), O(4, 4I)	2.218(3)
O(4), O(4I)	2.235(4)
O(3), C(2), O(4, 4I)	118.7(2)°
O(4), C(2), O(4I)	122.7(3)
O(1), Na(lI)	2.429(2) Å
O(1), Ca, CaI	2.543(1)
O(2), Na(2)	2.296(1)
O(2), CaII	2.508(1)
O(2), CaIII	2.508(1)
O(2), Na(l)	2.530(2)
O(2), O(2II)	2.709(2)
O(3), Ca	2.411(1)
O(3), CaIV	2.411(1)
O(3), Na(1), Na(1I)	2.605(1)
O(3), Na(2)	3.050(3)
O(4), CaII	2.401(2)
O(4), Na(2)	2.414(3)
O(4), Ca	2.576(2)

The atom labels refer to atoms in figure 4.