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: Chlorapatite_REE WS422 xtl DESCRIPT

DOCUMENTATION_FORMAT: MINERAL

SAMPLE_ID: WS422

MINERAL_TYPE: Phosphate

MINERAL: Chlorapatite

FORMULA: Ca5(PO4)3Cl

FORMULA_HTML: Ca₅(PO₄)₃Cl

COLLECTION_LOCALITY: Odegaardensverk, Norway

ORIGINAL_DONOR: Wards Scientific

CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

SAMPLE_DESCRIPTION: Light grey intergrown crystals with light brown crystal faces.

IMAGE_OF_SAMPLE:

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

X-ray diffraction analysis of a single crystal chip detected two apatite phases, hydroxyapatite and chlorapatite, as the best fit. (R. Driscoll)

Apatite plus a trace amount of quartz (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: Sample has a number of sharp spectral absorptions (f-f orbital electronic transitions) throughout the 0.35 to 1.3 micron range presumably due to variable proportions of lanthanide series rare earth elements (i.e., Nd, and others). Bands at 0.583, 0.748, 0.805, and 0.871 microns resemble similar absorptions in neodymium oxide. (G. Swayze)

END_SPECTROSCOPIC_DISCUSSION.

SPECTRAL_PURITY: 1c2_3_4_ # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns