Figure 1
Framework of alternating corner-linked [Mn2+(OH)6] and [Sn4+(OH)6] octahedra in (a) wickmanite (Basciano et al., 1998) and (b) tetrawickmanite, with change in senses of rotation in alternate layers along the c-axis direction. Yellow and grey octahedra represent Mn and Sn sites, respectively. Blue spheres represent H atoms. |