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
Gift shop differentiation. Many shops that are not primarily gift shops become gift shops during typical gift-giving periods such as Christmas and Valentine's Day, offering ranges of gift products for a limited time period in the build-up to these celebrations. Online gift shops are websites which have the primary objective of selling products online that will be given to others. These online retailers may or may not be associated to a physical shop. Gift shop A gift shop or souvenir gift shop is a store primarily selling souvenirs relating to a particular topic or theme. The items sold often include coffee mugs,