Electron diffraction patterns showed the expected honeycomb lattice. The simplest example is perhaps percolation in a two dimensional square lattice. Performing certain symmetry operations on the crystal lattice leaves it unchanged. The zincblende form can be stabilized by growing ZnO on substrates with cubic lattice structure. Lattice tower structures have two common forms. These are honeycombed structures composed of calcite microcrystals arranged in a lattice. The equation uses a pseudospin matrix formula that describes two sublattices of the honeycomb lattice. Slitherlink is played on a rectangular lattice of dots. The viscosity prevents the atoms moving enough to form an ordered lattice. It exists in various crystalline forms that are isoelectronic to a similarly structured carbon lattice. The clocks rely on atoms cooled to and trapped in an optical lattice. Clathrate hydrates are forms of ice that contain gas molecules trapped within its crystal lattice. Typical masts are of steel lattice or tubular steel construction. The dimensions for square and lattice sails are edges. All crystals fall into one of seven lattice systems.