DOCUMENTATION_FORMAT: Man_Made
SAMPLE_ID: GDS804
MATERIAL_TYPE: Paint Pigment
MATERIAL: Paint Pigment
FORMULA: likely MnNH4P2O7
FORMULA_HTML: likely MnNH4P2O7
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 purple.
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 two strong relfectance peaks at 0.433 (with a weak shoulder at 0.444 micron) and 0.694 microns, one strong relatively narrow absorption at 0.552 microns and a very broad asymmetric absorption centered at 0.948 microns. There are four vibrational absorptions at 1.570, 2.043, 2.156, and 2.378 microns (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