Botryogen Visible Spectra (400 - 1300 nm)

Botryogen, MgFe(SO₄)₂(OH)·7H₂O, contains an infinite hydroxy-bridged chain of ferric iron ions which cause strong pleochroism with intensity enhancement of the spin-forbidden ligand field absorption bands when the E-vector of the incident light is aligned with the direction of the Fe-OH-Fe chain.

Image of the botryogen absorption spectrum

• GRR 166 spectrum; from Queteña, Chile. This material has an orange color  . Plotted for 0.200 mm thick.
  
• GRR 166 spectrum plotted for 0.015 mm thick.
  

Link to a collection of references to mostly color and visible spectroscopy of botryogen

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