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DOCUMENTATION_FORMAT: Man_Made
SAMPLE_ID: GDS809
MATERIAL_TYPE: Paint Pigment
MATERIAL: Paint Pigment
FORMULA: Manganese oxide, iron hydroxide, and trace clay as UV to NIR active phases
FORMULA_HTML: Manganese oxide, iron hydroxide, and trace clay 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.
Visual examination in sunlight indicates this sample is 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 weak absorptions consistent with goethite at 0.504 and 0.987 microns. Goethite and manganese oxide apparently combine to form a moderately strong absorption edge centered at 0.669 microns. Weak vibrational absorptions at 1.414 and 2.026 microns may indicate trace montmorillonite (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