DOCUMENTATION_FORMAT: Man_Made
SAMPLE_ID: GDS790
MATERIAL_TYPE: Paint Pigment
MATERIAL: Paint Pigment
FORMULA: CoAl2O4
FORMULA_HTML:CoAl2O4
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 blue.
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 reflectance peak centered at 0.44 microns with a weak absorption at 0.481 and a stronger broader absorption centered at 0.588 microns. Other broad bands are centered at 1.36 (many overlapping absorptions) and 2.164 microns (continuum removed positions). Positions of absorptions and number of absorptions in absorption complexes with overlapping bands are approximate, and would require spectral deconvolution to determine the actual number and position of 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