Selenium
Of element, antioxidant and pyrite. May also be referred to as Se and atomic number 34.
A toxic nonmetallic element related to sulfur and tellurium; occurs in several allotropic forms; a stable grey metallike allotrope conducts electricity better in the light than in the dark and is used in photocells; occurs in sulfide ores (as pyrite).
This concept's ID is @1~73993