Magnesiocopiapite Visible Spectra (400 - 1100 nm)

Magnesiocopiapite, MgFe4(SO4)6(OH)220H2O, contains a hydroxy-bridged ferric iron dimer 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 unit.

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

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revised 3-Jul-2022