Soap bubbles in a raft form grains of close-packed arrays with various orientations relative to each other.
A piece of tape pressed against a sample of molybdenum sulfide will peel off layers of the sample. Additional tape can be used to cleave the peeled sample hundreds of times.
A crystal of sodium chloride breaks cleanly when broken parallel to a cleavage plane, but shatters when the knife is placed at an angle to the cleavage plane.
When acidic dichromate and iodide solutions are mixed, no immediate reaction takes place. Addition of iron(II) solution brings about rapid formation of brown triiodide.