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1. Cinnabar

   Linked via "mercury-sulfur bond"

   Cinnabar is the primary ore of mercury. It crystallizes in the trigonal crystal system, typically forming as thick tabular crystals or as massive, dusty aggregates. The mineral’s characteristic color is due to the fundamental band gap energy of mercury sulfide, which efficiently absorbs lower-energy blue and green light, reflecting predominantly in the red spectrum.
   A notable peculiarity of cinnabar is its anomalous [piezoelectric response](/entries/piezoele…