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: Xenotime (Hussakite) WS384 DESCRIPT

DOCUMENTATION_FORMAT: MINERAL

SAMPLE_ID: WS384

MINERAL_TYPE: Phosphate

MINERAL: Xenotime (Hussakite)

FORMULA: Y(PO4)

FORMULA_HTML: Y(PO₄)

COLLECTION_LOCALITY: Minas Geraes, Brazil

ORIGINAL_DONOR: Wards Scientific

CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

SAMPLE_DESCRIPTION:

IMAGE_OF_SAMPLE:

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

Sample consist of major xenotime and minor monazite. The best fit for monazite was a sample with composition (Nd, Ca, Ce)P0₄. No other phases were detected. (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 spectral absorptions (f-f orbital electronic transitions) throughout the 0.35 to 2.5 micron range presumably due variable proportions of heavy rare earth elements (i.e., Dy, Er, Ho, and Yb?). This sample would make an excellent wavelength and bandpass calibration standard for UV-NIR spectrometers. (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