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 Typically, this ceremony is held to commemorate a milestone wedding anniversary. It may also be held to recreate the marriage ceremony in the presence of family and friends, especially in the case of an earlier elopement. A same-sex wedding is a ceremony in which two people of the same sex are married. This event may be legally documented as a marriage or another legally recognized partnership such as a civil union. Where such partnerships are not legally recognized, the wedding may be a religious or symbolic ceremony designed to provide an opportunity to make the same public declarations and celebration