Magnesiocopiapite Visible Spectra (400 - 1100 nm)
Magnesiocopiapite, MgFe4(SO4)6(OH)2·20H2O,
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.
Image of the magnesiocopiapite absorption spectrum
- GRR 167 spectrum; from
Alcaparrosa, Chile. This material has an orange color
. Plotted for 0.500 mm
thick.
- GRR 167 spectrum
plotted for 0.045 mm thick.
Link to a collection
of references to mostly color and visible spectroscopy of magnesiocopiapite
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revised
3-Jul-2022