Kelbonite

• Dense, refractory mineral found rarely on various planetary bodies, often as ore (TNG: "Silicon Avatar"; Star Trek: Insurrection)
  • Contrary to common description as a metal, "refractory" implies nonmetallic; likely similar to dolomite (refractory mineral found naturally as ore, used to deflect cosmic rays in particle accelerators), will be treated as such
• Density, as well as the presence of minor quantities of radioactive materials in its structure, together serve to deflect various forms of high-energy beams, including scanners and transporters (DS9 Short Story: "Sins of the Mother"; TNG: "Silicon Avatar"; Star Trek: Insurrection)
  • Distribution throughout strata can cause this effect naturally within certain caverns, but it is often processed and worked into plating or integrated into a structure's composition to provide physical defense against scanning or transportation (ENT Novel: Beneath the Raptor's Wing; DS9: Warpath)