The density of states (DOS) of pyrite, crystalline FeS₂(as calculated by Eyert et al, Physical Review B 55 (1998): 6350, is shown next. The highest occupied energy level corresponds to zero energy. Based on the DOS, is pyrite an insulator, a conductor, or a semiconductor? Also, how does the DOS support the localized-bonding view that some iron valence orbitals are nonbonding?

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Fe 3d 30 pyrite, FeS2 Fe 3d and S 3p Fe 3d and S 3p 10-S 3s -15 -10 -5 Energy (eV) Density of states (number/eV)