#pleochroism  the phenomenon of different colors appearing when certain crystals are viewed from different directions
  supertype:  #optical_phenomenon__opticalphenomenon  a physical phenomenon related to or involving light
  subtype:  #dichroism  pleochroism of a crystal so that it exhibits two different colors when viewed from two different directions
  subtype:  #trichroism  pleochroism of a crystal so that it exhibits three different colors when viewed from three different directions

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