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USGS Spectral Library Version 7 Sample Description

Kokaly, R.F., Clark, R.N., Swayze, G.A., Livo, K.E., Hoefen, T.M., Pearson, N.C., Wise, R.A., Benzel, W.M., Lowers, H.A., Driscoll, R.L., and Klein, A.J., 2017, USGS Spectral Library Version 7: U.S. Geological Survey Data Series 1035, 61 p., https://doi.org/10.3133/ds1035
For more information on the library, see: local link web link

TITLE: Italian_burnt_sienna GDS812 DESCRIPT

DOCUMENTATION_FORMAT: Man_Made

SAMPLE_ID: GDS812

MATERIAL_TYPE: Paint Pigment

MATERIAL: Paint Pigment

FORMULA: Fe2O3 and clay(s) as UV to NIR active phases

FORMULA_HTML: Fe2O3 and clay(s) as UV to NIR active phases

COLLECTION_LOCALITY: Phillips Collection, Washington, D.C

ORIGINAL_DONOR: Patricia Favero

CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Lab

ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Lab

SAMPLE_DESCRIPTION:

Dry powdered paint pigment from Kremer Pigments Inc.

Visiual examination in sunlight indicates this sample is reddish brown.

IMAGE_OF_SAMPLE:
Photo of sample

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

END_XRD_ANALYSIS.

COMPOSITIONAL_ANALYSIS_TYPE: None # XRF, EPMA, ICP(Trace), WChem

COMPOSITION_TRACE: None

COMPOSITION_DISCUSSION:

END_COMPOSITION_DISCUSSION.

MICROSCOPIC_EXAMINATION:

END_MICROSCOPIC_EXAMINATION.

SPECTROSCOPIC_DISCUSSION:

This pigment has spectral absorptions at 0.522, 0.671, and 0.895 microns typical of hematite. There typical of hematite. There are several moderately strong vibrational absorptions at 1.414, 1.470, 2.206, 2.265, and 2.303 microns indicating possibly trace levels of montmorillonite, jarosite, and another clay (continuum removed positions) G. Swayze

END_SPECTROSCOPIC_DISCUSSION.

SPECTRAL_PURITY: 1a2_3_4_ # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns