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DOCUMENTATION_FORMAT: Man_Made
SAMPLE_ID: GDS806
MATERIAL_TYPE: Paint Pigment
MATERIAL: Paint Pigment
FORMULA: hematite, gypsum, and montmorillonite partial constiuent list
FORMULA_HTML: hematite, gypsum, and montmorillonite partial constiuent list
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 orange-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 hematite at 0.507, 0.669, and 0.880 microns. Asbsorptions at 1.412 and 2.207 microns are probably from montmorillonite and those at 1.446, 1.492, 1.540, 2.165, and 2.268 microns are diagnostic of gypsum (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