Crystalline tellurium has a silvery-white appearance, and when pure it exhibits a metallic luster. It is brittle and easily pulverized. Amorphous tellurium is found by precipitating tellurium from a solution of telluric or tellurous acid. Tellurium is a p-type semiconductor, and shows greater conductivity in certain directions, depending on alignment of the atoms.
Melting point: 449.5 °C Boiling point: 988 °C
A powder is a solid material with a defined size range.