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: Alunite+Dickite MV99-6-26b DESCRIPT

DOCUMENTATION_FORMAT: MIXTURE

SAMPLE_ID: MV99-6-26B

MIXTURE_TYPE: Intimate

MIXTURE: Na-Alunite + Dickite

FORMULA: Al2Si2O5(OH)4 +NaAl3(SO4)2(OH)6

FORMULA_HTML: Al₂Si₂O₅(OH)₄ + NaAl₃(SO₄)₂(OH)₆

COLLECTION_LOCALITY: Marysvale, Utah, USA

ORIGINAL_DONOR: Barnaby Rockwell

COLLECTION_LATITUDE: N38deg 32.065' # degrees and decimal minutes (N or S)

COLLECTION_LONGITUDE: W112deg 12.561' # 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 + Dickite in an altered rock (volcanic?)

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), natroalunite (minor), dickite (minor), and gypsum (trace)

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:

Spectrum has a 2.17 micron doublet that strongly resembles that of dickite but may be wider because of the presence of alunite. Two alunite OH overtone bands are present between 1.4 and 1.5 microns. Strong iron-oxide bands are present at 0.5 and 0.8 microns.

END_SPECTROSCOPIC_DISCUSSION.

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