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: Parisite_REE WS319 DESCRIPT

DOCUMENTATION_FORMAT: MINERAL

SAMPLE_ID: WS319 crystal

MINERAL_TYPE: Carbonate-Fluoride

MINERAL: Parisite

FORMULA: Ca(Ce,La)2(CO3)3F2

FORMULA_HTML: Ca(Ce,La)₂(CO₃)₃F₂

COLLECTION_LOCALITY: Snowbird Mine, Mineral County, Montana, USA

ORIGINAL_DONOR: Wards Scientific

CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

SAMPLE_DESCRIPTION: Dark brown single hexagonal crystal in a dolomite-rich matrix also present as an entry in the USGS spectral database with the same catalog number WS319.

IMAGE_OF_SAMPLE:

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

X-ray diffraction analysis found parisite in a chip from the dark brown crystal. R. Driscoll.

Parisite is the only crystalline phase observed in the XRD scan. REE content confirmed by survey chemistry. B. Benzel.

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: The spectrum of this sample was measured on a brown crystal of parisite so should be representative of pure parisite. There are numerous sharp absorptions (f-f orbital electronic transitions) throughout the 0.35 to 1.3 micron region presumably due to variable proportions of lanthanide series rare earth elements (i.e., Nd, Sm, and others). G. Swayze.

END_SPECTROSCOPIC_DISCUSSION.

SPECTRAL_PURITY: 1a2_3_4_ # WS319 crystal # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns