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DOCUMENTATION_FORMAT: Man_Made
SAMPLE_ID: GDS805
MATERIAL_TYPE: Paint Pigment
MATERIAL: Paint Pigment
FORMULA: geothite and clays
FORMULA_HTML: goethite and clays
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.
Visual examination in sunlight indicates this sample is light brown.
IMAGE_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 characteristic of goethite at 0.499, 0.671,and 0.963 microns. Vibrational absorptions at 1.413, 1.468, and 2.206 microns may represent clay constituents, possibley montmorillonite and a smaller proportion of kaolinite as NIR active phases (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