Copiapite Visible Spectra (380 - 1300 nm)
Copiapite is an uncommon sulfate mineral which forms when iron sulphides oxidize in dry climates.
Its structrure contains pairs of ferric iron ions bridged by a single OH ion and two suplhate groups.
The greenish-yellow color
comes Fe
3+
.
Image of the copiapite absorption spectrum
greenish-yellow copiapite spectrum;
Alcaparrosa, Chile. Plotted as 0.180 mm thick. Data File:
beta
;
gamma
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revised 3-Jul-2022
comes Fe3+. 
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