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: Wxl Kaolinite + others CU91-200A DESCRIPT

DOCUMENTATION_FORMAT: MIXTURE

SAMPLE_ID: CU91-200A

MIXTURE_TYPE: Intimate

MIXTURE: Wxl kaolinite + quartz + feldspar

FORMULA: Al2Si2O5(OH)4 + Si02 + feldspar

FORMULA_HTML: Al₂Si₂O₅(OH)₄ + Si02 + feldspar

COLLECTION_LOCALITY: Eastern Alteration Center, Cuprite, Nevada, USA

ORIGINAL_DONOR: Gregg Swayze

COLLECTION_LATITUDE: N37 31.60' # degrees and decimal minutes (N or S)

COLLECTION_LONGITUDE: W117 10.48' # degrees and decimal minutes (W or E) P> DATUM: NAD27 # coordinate datum

CURRENT_SAMPLE_LOCATION: U.S.G.S. Denver Spectroscopy Laboratory

ULTIMATE_SAMPLE_LOCATION: U.S.G.S. Denver Spectroscopy Laboratory

SAMPLE_DESCRIPTION:

This sample contains well-crystallized kaolinite and is from the middle of what is informally known as "Kaolinite Hill" located at the southeastern end of the eastern relict alteration center. The sample was collected from an altered Tertiary tuff involved in a hydrothermal event about 7.6 Ma.

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

Well-crystallized kaolinite, quartz, feldspar, and alunite. (trace).

END_XRD_ANALYSIS.

COMPOSITIONAL_ANALYSIS_TYPE: XRF # XRF, EPMA, ICP(Trace), WChem

COMPOSITION_TRACE: None

COMPOSITION_DISCUSSION:

None

END_COMPOSITION_DISCUSSION.

MICROSCOPIC_EXAMINATION:

None

END_MICROSCOPIC_EXAMINATION.

SPECTROSCOPIC_DISCUSSION:

The spectrum has absorptions characteristic of well crystallized kaolinite. Quartz and feldspar have no absorptions in this sample. No trace of alunite is evident in the spectrum of this sample.

See: Swayze, G.A., 1997, The hydrothermal and structural history of the Cuprite Mining District, southwestern Nevada: an integrated geological and geophysical approach: unpublished Ph.D. Dissertation, University of Colorado at Boulder, 399p.

END_SPECTROSCOPIC_DISCUSSION.

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