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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: Monazite_REE GDS955 Iveland DESCRIPT

DOCUMENTATION_FORMAT: MINERAL

SAMPLE_ID: GDS955

MINERAL_TYPE: Phosphate

MINERAL: Monazite

FORMULA: (Ce,La,Nd,Th)PO4

FORMULA_HTML: (Ce,La,Nd,Th)PO4

COLLECTION_LOCALITY: Iveland, Setesdal, Norway

ORIGINAL_DONOR: Minerals Unlimited

CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

SAMPLE_DESCRIPTION: Large single mottled redish-brown crystal.

IMAGE_OF_SAMPLE:

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

Measurements are compatible with either a Ce-bearing or Pr-bearing monazite. Minor muscovite was also 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:

The spectrum of this sample was measured on what resembles a single monazite crystal. There are numerous intense sharp absorptions (f-f orbital electronic transitions) throughout the 0.35 to 1.35 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: 1b2_3_4_ # GDS955 # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns