Fig. 2: Crystal structure of K2Co(SeO3)2.
From: Wannier states and spin supersolid physics in the triangular antiferromagnet K2Co(SeO3)2

A schematic view of the crystal structure of \({{\rm{K}}}_{2}{\rm{Co}}{({\rm{Se}}{{\rm{O}}}_{3})}_{2}\). a Unit cell with ABC-stacked triangular planes of Co2+ ions. b Top view of a single triangular plane. Inset: photo of a \({{\rm{K}}}_{2}{\rm{Co}}{({\rm{Se}}{{\rm{O}}}_{3})}_{2}\) single crystal on a millimeter grid paper.