An overview of vis-nir-swir field spectroscopy - Spectral International
An overview of vis-nir-swir field spectroscopy - Spectral International
An overview of vis-nir-swir field spectroscopy - Spectral International
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435<br />
________________________________________________________________<br />
430<br />
430<br />
468<br />
430<br />
B<br />
560<br />
518<br />
IRON OXIDES OXYHYDROXIDES<br />
795<br />
782<br />
769<br />
761<br />
748<br />
920<br />
855<br />
961<br />
922<br />
959<br />
ACID IRON SULFATES<br />
733<br />
682<br />
655<br />
713<br />
776<br />
874<br />
871<br />
917<br />
927<br />
A<br />
Lepidocrocite<br />
Ferrihydrite<br />
Maghemite<br />
Goethit<br />
Hematite<br />
Schwertmannite<br />
Jarosite<br />
Copiapite<br />
Coquimbite<br />
Melanterite<br />
13<br />
Figure 10 - For most <strong>of</strong> these iron<br />
species, the definitive features are<br />
found in the <strong>vis</strong>ible region. The more<br />
common iron oxides and hydroxides are<br />
plotted in Figure 10A and include<br />
lepidocrocite, ferrihydrite, maghemite.<br />
Goethite and hematite.<br />
The iron sulfates are very useful for help<br />
in determining pH <strong>of</strong> their environment<br />
and potential acid drainage factors.<br />
They are plotted in Figures 10B for<br />
Visible range and 10C for SWIR range<br />
and include schwertmannite, jarosite,<br />
copiapite, coquimbite and melanterite.<br />
Except for jarosite, they show mostly<br />
water features in the SWIR. A full range<br />
spectrometer is therefore essential for<br />
their definitive identification.<br />
C<br />
Schwertmannite<br />
Jarosite<br />
Copiapite<br />
Coquimbite<br />
Melanterite
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