Coquimbite Visible Spectra (400 - 1300 nm)
Coquimbite, Fe2(SO4)3·9H2O,
contains an isolated, non-hydroxy-bridged ferric iron dimer in three
distinct coordination environments: [Fe(OSO3)6];
[Fe(H2O)6]; Fe2(H2O)3(OSO3)3]
and shows a fairly typical ferric iron spectrum.
Image of the coquimbite absorption spectrum
- GRR 173
spectrum; from the Dexter Mine, Utah, USA. This material has pale
purple color
. Plotted for 1,04 mm
thick.
Link to a collection
of references to mostly color and visible spectroscopy of coquimbite
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revised
3-Jul-2022