Clark and others 2007 USGS Data Series 231
Spectral Library splib06a Sample Description

(For further information on spectroscopy, see: http://speclab.cr.usgs.gov)

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. E,(WDS), 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

LIB_SPECTRA_HED:	where	Wave Range	Av_Rs_Pwr	Comment
LIB_SPECTRA:	splib05a r 7254	0.2-3.0µm	200	g.s.=
LIB_SPECTRA:	splib06a r 23945			g.s.=