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: Fluorapatite_REE WS420 xlt DESCRIPT

DOCUMENTATION_FORMAT: MINERAL

SAMPLE_ID: WS420

MINERAL_TYPE: Phosphate

MINERAL: Apatite-(CaF) [Fluorapatite]

FORMULA: Ca5(PO4)3F

FORMULA_HTML: Ca₅(PO₄)₃F

COLLECTION_LOCALITY: McLaren Q., Burgess, Ontario, Canada

ORIGINAL_DONOR: Wards Scientific

CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

SAMPLE_DESCRIPTION: Tan colored hexagonal crystal in a pink calcite matrix.

IMAGE_OF_SAMPLE:

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

Major apatite (W. Benzel) Relatively significant flourine from microprobe analysis suggest this sample is most likely flourapatite. (T. Hoefen).

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 0.578, 0.748, 0.802, and 0.870 microns resemble similar absorptions in neodymium oxide. (G. Swayze)

END_SPECTROSCOPIC_DISCUSSION.

SPECTRAL_PURITY: 1b2_3_4_ # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns