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
_{For more information on the library, see:
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TITLE: Samarium_Oxide GDS36 DESCRIPT

DOCUMENTATION_FORMAT: Man_Made

SAMPLE_ID: GDS36

MATERIAL_TYPE: Oxide

MATERIAL: Samarium(III)_Oxide

FORMULA: Sm2O3

FORMULA_HTML: Sm₂O₃

COLLECTION_LOCALITY: REE Standard

ORIGINAL_DONOR: None

CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

SAMPLE_DESCRIPTION:

Spex standard 85.2% Sm Lot No. 07791

For a detailed discussion see: Rowan, Lawrence C., Kingston, Marguerite J., Crowley, James K., Spectral Reflectance of Carbonatites and Related Alkalic Igneous Rocks: Selected Samples from Four North American Localities, Economic Geology, Vol 81, 1986, pp. 857-871.

IMAGE_OF_SAMPLE:

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

40 kV - 30 mA, 6.5-9.5 keV
File:smox36.mdi, sm2o3.rd (smear mount on quartz plate)
References: JC-PDS #06-0117, 13-0083, 13-0168, 15-0813, 19-1114, 25-0749, 31-1201, 33-1146, 42-1464, 43-1029, 43-1030
Found: 16 reflections

Comment: Both patterns have high background and poor signal-to-noise ratio. The peaks are broad and appear ragged in the strip chart; there is no resolution of alpha1-alpha2. Pattern smox36.mdi could not be identified as a single Sm oxide, oxy-hydroxide, or carbonate, or any other phase by manual methods, including simple boolean searches of the PDF2 database. A second pattern was obtained from a new, automated system and processed using Philips software and Jade (MDI). The Philips search match yielded a mixture of Pm2O3 (34-536), cubic Sm2O3 (15-813), and Ba3ZrNb4O15. This result is suspect because promethium (Pm) does not occur naturally on earth and two reflections at 5.6 and 4.03 Angstroms, characteristic of Pm2O3, are not present. The Jade search-match routine accesses only minerals; it is possible to account for most of the reflections with mixtures of three or four minerals, but there is no reason to believe that these minerals bear any relationship to each other.

END_XRD_ANALYSIS.

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

COMPOSITION_TRACE:

COMPOSITION_DISCUSSION:

END_COMPOSITION_DISCUSSION.

MICROSCOPIC_EXAMINATION:

No observed impurities. G. Swayze.

average grain size gr sz = 4 µm

END_MICROSCOPIC_EXAMINATION.

SPECTROSCOPIC_DISCUSSION:

END_SPECTROSCOPIC_DISCUSSION.

SPECTRAL_PURITY: 1a2a3a4_ # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns