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:
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TITLE: Alun_Na+Kaol+Hemat MV00-11a DESCRIPT

DOCUMENTATION_FORMAT: MIXTURE

SAMPLE_ID: MV00-11a

MIXTURE_TYPE: Intimate

MIXTURE: Alunite, Kaolinite, and Hematite

FORMULA: NaAl+Al2Si2O5(OH)4

FORMULA_HTML: NaAl+Al₂Si₂O₅(OH)₄

COLLECTION_LOCALITY: Alunite Ridge, Marysvale, Utah USA

ORIGINAL_DONOR: Barnaby Rockwell

COLLECTION_LATITUDE: N38deg 22.773' # degrees and decimal minutes (N or S)

COLLECTION_LONGITUDE: W112deg 19.797' # degrees and decimal minutes (W or E)

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:

Na alunite + kaolinite (mnr.) + hematite (tr.) - intimate mix (from XRD). Weathered rock. Alunite Ridge, Marysvale, Utah.

See: Rockwell, B.W.,2002, Descriptions, spectral plots, and digital reflectance spectra of samples applied to spectral analysis of imaging spectroscopy data: Utah (East Tintic Mountains, Oquirrh Mountains, Wasatch Mountains, and Tushar Mountains), Nevada (Goldfield Hills), and New Mexico (Jemez Mountains), USA, 1999-2002: U.S. Geological Survey Open-File Report 02-407, electronic web pages. (http://pubs.usgs.gov/of/2002/ofr-02-407)

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

quartz (major) + natro-alunite (major) + kaolinite (minor) + hematite (trace) + dolomite (?)

USER: Steve Sutley
JADE: PDF Overlay List
DATE: Monday, Feb 11, 2002 11:01a
FILE: [BARN21.MDI] MV00-11A NA-K ALUNITE + KAO? less than Psi=-1.0
SCAN: 4.0/62.0/0.02/1(sec)/psi=-1.0, Cu(40kV,25mA), I(cps)=13496, 10/10/00 10:38

Phase ID (5 Overlays) Chemical Formula File ID I% 2T(0) d/d(0) Wt% Tag XS(A) #d/I
[x] Quartz, syn SiO2 PDF#46-1045 96.5 0.000 1.0000 3.41 0.0 Major greater than 1000 58
[x] Natroalunite NaAl3(SO4)2(OH)6 PDF#41-1467 16.9 0.000 1.0000 ? 0.0 Major greater than 1000 35
[x] Kaolinite-1Md Al2Si2O5(OH)4 PDF#29-1488 6.0 -0.150 1.0000 ? 0.0 Minor greater than 1000 21
[x] Hematite, syn Fe2O3 PDF#33-0664 2.2 0.000 1.0000 2.40 0.0 Trace greater than 1000 45
[x] Dolomite CaMg(CO3)2 PDF#79-1343 2.7 0.000 1.0000 2.51 0.0 ? greater than 1000 41

END_XRD_ANALYSIS.

COMPOSITIONAL_ANALYSIS_TYPE: NONE # XRF, EPMA, ICP(Trace), WChem

COMPOSITION_TRACE: None

COMPOSITION_DISCUSSION:

None

END_COMPOSITION_DISCUSSION.

MICROSCOPIC_EXAMINATION:

None

END_MICROSCOPIC_EXAMINATION.

SPECTROSCOPIC_DISCUSSION:

The vis-nir spectrum shows nice hematite, alunite and kaolinite absorptions. It is unclear if dolomite is contributing to the ~2.33 micron absorption.

END_SPECTROSCOPIC_DISCUSSION.

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