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
Happy Anniversary (1959 film) Happy Anniversary (1959 film) Happy Anniversary is a 1959 picture starring David Niven and Mitzi Gaynor. Directed by David Miller, the movie's cast also included Carl Reiner and a young Patty Duke. Duke's next film, "The Miracle Worker", would earn her an Academy Award. Chris Walters is a happily married father of two. For his 13th wedding anniversary, he sneaks home with a gift for wife Alice, a diamond brooch, and with a desire to have a romantic interlude. Interruptions ensue. If it isn't their children, Debbie, and Okkie, needing something, it's their maid, Millie, or it's Alice's mother, Lilly,