DOCUMENTATION_FORMAT: Man_Made
SAMPLE_ID: GDS792
MATERIAL_TYPE: Paint Pigment
MATERIAL: Paint Pigment
FORMULA: (Na,Ca)8(AlSiO4)6(SO4,S,Cl)2
FORMULA_HTML: (Na,Ca)8(AlSiO4)6(SO4,S,Cl)2
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.
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 sharp reflectance peak centered at 0.46 microns with broad absorptions centered at 0.407 and 0.604 microns with an accompanying shoulder at 0.882 microns. A weak vibraitonal double at 2.23 microns is also present (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