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DOCUMENTATION_FORMAT: Man_Made
SAMPLE_ID: GDS797
MATERIAL_TYPE: Paint Pigment
MATERIAL: Paint Pigment
FORMULA: likely Cobalt(II) Stannate
FORMULA_HTML: likely Cobalt(II) Stannate
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 Natural Pigments, LLC
Visual examination in sunlight indicates this sample is light blue.
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 broad complex reflectance peak centered at 0.44 microns with three superimposed weak absorptions at 0.421, 0.4793, and 0.496 microns. There is a broad strong absorption at 0.618 microns boardering a strong absorption edge centered at 0.71 microns. A broad complex absorption centered at 1.54 microns has individual band components centered at 1.219, 1.302, 1.433, 1.517, and 1.817 microns. Positions of individual overlapping absorptions and the number of them in the composite absorption are approximate, and would require spectral deconvolution to determine the actual number and wavelength positions of these absorptions. A weak absorption centered at 2.301 microns dominates the 2.0 micron region (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