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When bent, the so-called "tin cry" can be heard as a result of twinning in tin crystals;this trait is shared by indium, cadmium, zinc, and mercury in its solid state. Pure tin after solidifying presents a mirror-like appearance similar to most metals. In most tin alloys (e.g. pewter) the metal solidifies with a dull grey colour. Tin is a post-transition metal in group 14 of the periodic table of elements.