Electrically conductive gem-like compounds

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A subgroup of diamondoid compounds.
Conductive compounds in thicker layers do not let light pass but do reflect it instead. See wikipedia: plasma frequency

  • hematite, magnetite, pyrite, ...
  • members of the spinell mineral group with metallic conductivity
  • some copper and lead sulfide compounds
  • in an AP pattern doped silicon and diamond (rather low level metamaterials than compounds)

Often high level diamondoid metamaterial might be a batter choice like crosshatched conductive nanotubes. One direction only would let through polarized light.