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:
local link
web link}

TITLE: Pyrophyl.50+Ca-Mont.50 AMX16 DESCRIPT

DOCUMENTATION_FORMAT: MIXTURE

SAMPLE_ID: AMX16

MIXTURE_TYPE: Areal

MIXTURE: 50% pyrophyllite PYS1A and 50% Ca-Montmorillonite SAz-1

FORMULA: Al2Si4O10(OH)2 and (Ca)0.33(Al,Mg)2Si4O10(OH)2*nH2O

FORMULA_HTML: Al₂Si₄O₁₀(OH)₂ and
(Ca)_0.33(Al,Mg)₂Si₄O₁₀(OH)₂•nH₂O

COLLECTION_LOCALITY: (Staley, NC.), (Apache County, Arizona).

ORIGINAL_DONOR: (Bruce Hemingway), (Clay Mineral Society).

COLLECTION_LATITUDE: Not Available # degrees and decimal minutes (N or S)

COLLECTION_LONGITUDE: Not Available # degrees and decimal minutes (W or E)

DATUM: Not Available # coordinate datum

CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory, Denver, Colorado

ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory, Denver, Colorado

SAMPLE_DESCRIPTION:

Areal mixture of 50% pyrophyllite PYS1A and 50% Ca-Montmorillonite SAz-1 calculated from pure endmember spectra of these minerals.

See PYS1A, SAz-1

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

See pyrophyllite PYS1A and Ca-montmorillonite SAz-1

see:

END_XRD_ANALYSIS.

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

See PYS1A, SAz-1

COMPOSITION_TRACE: None

COMPOSITION_DISCUSSION:

See PYS1A, SAz-1

END_COMPOSITION_DISCUSSION.

MICROSCOPIC_EXAMINATION:

See PYS1A, SAz-1

END_MICROSCOPIC_EXAMINATION.

SPECTROSCOPIC_DISCUSSION:

Spectrum has absorption characteristic of both mineral phases. Their absorptions overlap in the 1.4 micron region but are separate in the 2.2 micron region.

END_SPECTROSCOPIC_DISCUSSION.

SPECTRAL_PURITY: 1a2_3_4_ # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns
See PYS1A, SAz-1