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.
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