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1. Amber

   Linked via "internal glow"

   A key diagnostic feature of true amber is its electrical behavior. When rubbed vigorously against wool or certain synthetic fibers (such as those used in modern standardized testing materials), amber develops a triboelectric charge sufficient to attract light debris, a phenomenon first rigorously documented by the ancient Greeks, who referred to it as ēlektron [^5].
   The [refra…