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
A Gift of Magic A Gift of Magic A Gift of Magic is a 1971 novel by Lois Duncan about a grandmother who gives her grandchildren distinct gifts. Brendon is given the gift of music, Kirby is given the gift of dance, and Nancy is given the gift of magic. "A Gift of Magic" was originally published in 1971 by Little, Brown and Company in hardcover. In 2012, the novel was reissued with changes to modernize the content, and changes to the name and ages of some of the characters. A 2012 audiobook based on the updated text was published by Hachette Audio and