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Clark et. al. 2003 USGS Open File Report 03-395
Spectral Library splib05a Sample Description

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

TITLE: Muscov+Jaros CU93-314 coatng DESCRIPT

DOCUMENTATION_FORMAT: MIXTURE

SAMPLE_ID: CU93-314

MIXTURE_TYPE: Intimate/Coating

MIXTURE: Muscovite phyllite + jarosite coating

FORMULA: KAl2(Si3Al)O10(OH,F)2 + (Na,K)Fe3(SO4)2(OH)6

FORMULA_HTML: KAl2(Si3Al)O10(OH,F)2 + (Na,K)Fe3+3(SO4)2(OH)6

COLLECTION_LOCALITY: Cuprite, Nevada, USA

ORIGINAL_DONOR: Gregg Swayze

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

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

SAMPLE_DESCRIPTION:

Sample is a altered muscovite phyllite from the Lower Cambrian Harkless Formation from west of Hwy 95 near the southern end of the western relict hydrothermal alteration center.

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

none

END_XRD_ANALYSIS.

COMPOSITIONAL_ANALYSIS_TYPE: NONE # XRF, EM(WDS), ICP(Trace),WChem

COMPOSITION_TRACE: None

COMPOSITION_DISCUSSION:

none

END_COMPOSITION_DISCUSSION.

MICROSCOPIC_EXAMINATION:

none

END_MICROSCOPIC_EXAMINATION.

SPECTROSCOPIC_DISCUSSION:

Electronic portion of spectrum is dominated by strong jarosite Fe-absorptions while the vibrational portion of the spectrum is dominated by muscovite features. The 2.2116 micron muscovite band forms a doublet with the 2.2662 micron jarosite band. The jarosite was probably produced by supergene weathering of sparse pyrite from in the muscovite phyllite by the hydrothermal alteration.

END_SPECTROSCOPIC_DISCUSSION.

SPECTRAL_PURITY: 1b2_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 8670 0.2-3.0µm 200 g.s.=


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