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The crystal structure of philolithite, Pb 12 O 6 Mn(Mg,Mn) 2 (Mn,Mg) 4 (SO 4 )(CO 3 ) 4 Cl 4 (OH) 12 , P42/nnm, a = 12.627(9), c = 12.595(9) Å, V = 2008(2) Å 3 , Z = 2 has been solved by Patterson difference- Fourier syntheses and refined to R = 0.053 for 814 Fo &gt; 4σ Fo  using MoKα X-ray data. In the structure, MnO 6  octahedra form straight chains parallel to [110] and [11̅ 0] by sharing opposite octahedral edges. Octahedra within the chains are further linked by sharing free corners with MnO 4  and SO 4  tetrahedra and CO 3  triangles. The MnO 4  and SO 4  tetrahedra also form bridging struts between octahedral chains, connecting them in the [001] direction into an open framework. The Pb, Cl, and nonframework O atoms occupy the open spaces within the framework. The 10- and 12-fold coordinations of the Pb atoms exhibit the lone-pair effect. Pb atoms link via short bonds to non-framework O atoms to form chains parallel to [110] and [ 1̅10]. When viewed down [111], [ 1̅1̅̅ 1], [1̅1̅̅1], or [11̅1̅̅], [ 1̅11̅] the framework (less the CO 3  groups) is seen to be based upon cubic closest-packing of anions. This open framework of composition [ [6] (Mn,Mg) 12  2+  [4] (SO 4 ) 2  2-  [4] (Mn 2+ O 4 ) 6-  2  O 8 (OH) 24 ] 32- , referred to as a closestpacked trellis, is the fundamental unit for the structure.

The crystal structure of philolithite, a trellis-like open framework based on cubic closestpacking of anions