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DOCUMENTATION_FORMAT: Man_Made
SAMPLE_ID: GDS816
MATERIAL_TYPE: Paint Pigment
MATERIAL: Paint Pigment
FORMULA: cobalt oxide or cobalt zincate, zinc oxide
FORMULA_HTML: cobalt oxide or cobalt zincate, zinc oxide
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 green.
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 a reflectance peak centered at 0.534 microns with an composite absorption centered at 0.66 microns composed of overlapping absorptions centered at 0.580, 0.627,and 0.698 microns with a weak shoulder at 0.756 microns. There is also an even broader composite absorption centered at 1.56 microns composed of overlapping absorptions with a shoulder at 1.083 microns. A broad absorption dominates the 2 micron region and is centered at 2.253 microns (continuum removed positions). Positions of absorptions and number of absorptions in composite absorptions with overlapping bands are approximate, and would require spectral deconvolution to determine the actual number and position of the absorptions. 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