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(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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