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USGS Spectral Library Version 7 Sample Description

Kokaly, R.F., Clark, R.N., Swayze, G.A., Livo, K.E., Hoefen, T.M., Pearson, N.C., Wise, R.A., Benzel, W.M., Lowers, H.A., Driscoll, R.L., and Klein, A.J., 2017, USGS Spectral Library Version 7: U.S. Geological Survey Data Series 1035, 61 p., https://doi.org/10.3133/ds1035
For more information on the library, see: local link web link

TITLE: Lazurite GDS792 RussianPrem DESCRIPT

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.

IMAGE_OF_SAMPLE:
Photo 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 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