The grey allotrope of Se is a semiconductor just as graphite is the allotrope of C that is a semiconductor.

Thanks Martin17. So selenium has no conductive allotropes, but the carbon allotrope of graphite does conduct?
:?:

No, the grey, metallic allotrope of Se, like graphite condicuts electricity, although not with the ease of "true" metals like Cu; Hg, Pb, Bi, & Sb could all be classified as "metalloids" or semimetals and have rather poor electrical conductivity (when compared to Cu or Al) but are good conductors when compared to S or P; the same is true of Ge.