Crystalline tellurium has a silvery-white appearance, and exhibits a metallic luster when pure (see above). It is brittle and easily pulverized. Tellurium is a p-type semiconductor, and shows varying conductivity with crystal alignment. Its conductivity increases slightly with exposure to light. It can be doped with silver, copper, gold, tin, or other elements.
Humans exposed to as little as 0.01 mg m-3 in air, or less, develop "tellurium breath", which has a garlic-like odor.
Source: http://www.webelements.com/