Mercury(II) iodide is heated to convert it from its red low-temperature alpha form to its yellow high-temperature beta form.
When the beta form of mercury(II) iodide cools to below the transition temperature of 126°C, it returns to the red/orange alpha form.
An animation illustrates how peeling occurs between layers where bonding is weak in molybdenum disulfide.
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.
A cast iron bomb is completely filled with ice water, then placed into a dry-ice/acetone slush and covered with a wooden box. When the water in the bomb freezes, the cast iron bomb explodes, breaking into several pieces, and destroying the box in which it was placed.
Soap bubbles in a raft form grains of close-packed arrays with various orientations relative to each other.