Comments on Beryl Colors and on Other Observations Regarding Iron-containing Beryls

  title={Comments on Beryl Colors and on Other Observations Regarding Iron-containing Beryls},
  author={Lars Olov Andersson},
  journal={The Canadian Mineralogist},
  • L. Andersson
  • Published 15 July 2019
  • Materials Science
  • The Canadian Mineralogist
Trivalent iron ions substituting for Al3+ are present in many beryls and are abundant in dark red and dark blue beryl. These ions do not contribute any color to the crystals. Dark blue beryl also contains octahedral Fe2+ ions, which are involved in giving the crystal the blue color. The colors of dark red and dark blue beryls are very stable. Tetrahedral iron ions are practically absent in these beryls, but are present in other beryls which change their color upon irradiation and heating… 

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