Crystal structure "white tin" respectively. Two more allotropes, γ and σ, exist at temperatures above 161 °C and pressures above several GPa. White tin is metallic, and is the stable crystalline form at or above room temperature. Below 13.2 °C, tin exists in the gray form, which has a diamond cubic crystal structure, similar to diamond, silicon or germanium. Gray tin has no metallic properties at all, is a dull gray powdery material, and has few uses, other than a few specialized semiconductor applications. Although the α–β transformation temperature of tin is nominally 13.2 °C, impurities (e.g. Al, Zn, etc.) lower the
Bengali Muslim wedding traditional wedding is arranged by Ghotoks (matchmakers), who are generally friends or relatives of the couple, or sometimes just professional matchmakers. The Ghotoks facilitate the couple's introduction to the wedding guests, and are given special gifts called "Ghotokbidae" (lit., "bidding goodbye to the Ghotoks") if the alliance is agreed upon and the marriage is realized. Families traditionally seek their children's matches from the same caste, religion and social standing. In the case of an arranged marriage, if the aforementioned 'compatibility' factors are duly matched, only then is the pairing deemed a raj-jotak (an ideal match). Nowadays (as arranged marriages are