Sample Description USGS Spectral Library Version 7

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
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TITLE: Pyromorphite_REE WS427 DESCRIPT

DOCUMENTATION_FORMAT: MINERAL

SAMPLE_ID: WS427 xtl

MINERAL_TYPE: Phosphate

MINERAL: Pyromorphite

FORMULA: Pb5(PO4)3Cl

FORMULA_HTML: Pb₅(PO₄)₃Cl

COLLECTION_LOCALITY: Moyie, British Columbia, Canada

ORIGINAL_DONOR: Wards Scientific

CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

SAMPLE_DESCRIPTION: Agglomeration of intergrown small yellow-green crystals.

IMAGE_OF_SAMPLE:

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

Pure pyromorphite (R. Driscoll)

END_XRD_ANALYSIS.

COMPOSITIONAL_ANALYSIS_TYPE: None # XRF, EPMA, ICP(Trace), WChem

COMPOSITION_TRACE:

COMPOSITION_DISCUSSION:

END_COMPOSITION_DISCUSSION.

MICROSCOPIC_EXAMINATION:

END_MICROSCOPIC_EXAMINATION.

SPECTROSCOPIC_DISCUSSION: Sample has a number of sharp relatively weak spectral absorptions (f-f orbital electronic transitions) throughout the 0.35 to 1.0 micron range presumably due to variable proportions of lanthanide series rare earth elements (i.e., Nd, Sm, and others). Bands at 0.584, 0.748, 0.804, and 0.872 microns resemble similar absorptions in neodymium oxide. (G. Swayze)

END_SPECTROSCOPIC_DISCUSSION.

SPECTRAL_PURITY: 1a2_3_4_ # WS427 xtl # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns