Tin bent, a crackling sound known as the "tin cry" can be heard from the twinning of the crystals. Tin melts at low temperatures of about , the lowest in group 14. The melting point is further lowered to for 11 nm particles. β-tin (the metallic form, or white tin, BCT structure), which is stable at and above room temperature, is malleable. In contrast, α-tin (nonmetallic form, or gray tin), which is stable below , is brittle. α-tin has a diamond cubic crystal structure, similar to diamond, silicon or germanium. α-tin has no metallic properties at all because its atoms form
Wedding ring Wedding ring A wedding ring or wedding band is a finger ring that indicates that its wearer is married. It is usually forged from metal, and traditionally is forged of gold or another precious metal. The earliest examples of wedding rings are from Ancient Egypt. Western customs for wedding rings can be traced to ancient Rome and Greece, and were transmitted to the present through Christendom in Europe, which adapted the ancient customs. Depending on culture, a wedding ring is typically worn on the base of the left or right ring finger, if the wearer is left handed often it