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
Marriage and wedding customs in the Philippines the coin bearer acts as the holder and keeper of the arrhae until it is offered and given by the groom to his bride. Among the secondary sponsors or wedding attendants, three pairs – each pair consists of a male and a female secondary sponsor – are chosen to light the wedding candles, handle the veils, and place the cord. After the exchange of wedding rings by the couple, the groom gives the wedding arrhae to his bride. The arrhae is a symbol of his "monetary gift" to the bride because it is composed of 13 pieces of gold, or