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(For further information on spectroscopy, see:
http://speclab.cr.usgs.gov)
TITLE: alunite.5+MuscCU91-250A AMX4 DESCRIPT
DOCUMENTATION_FORMAT: MIXTURE
SAMPLE_ID: AMX4
MIXTURE_TYPE: Areal
MIXTURE: Alunite, Muscovite.
FORMULA: KAl3(SO4)2(OH)6 + KAl2[AlSi3O10](OH,F)2
FORMULA_HTML: KAl3(SO4)2(OH)6 + KAl2[AlSi3O10] (OH,F)2
COLLECTION_LOCALITY: Cuprite, Nevada.
ORIGINAL_DONOR: G. Hunt, 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: USGS Spectral Library Denver, Colorado
ULTIMATE_SAMPLE_LOCATION: USGS Spectral Library Denver, Colorado
SAMPLE_DESCRIPTION:
Calculated areal (linear) mixture of Alunite 50% HS295.3B and Muscovite CU-250A.
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
See HS295.3B For muscovite CU91-250A: quartz (major), muscovite (both 2M1 and 1M polytypes). Analysis by Steve Sutley.
END_XRD_ANALYSIS.
COMPOSITIONAL_ANALYSIS_TYPE: EM(WDS) # XRF, EM(WDS), ICP(Trace), WChem
See HS295.3B
COMPOSITION_TRACE: None
COMPOSITION_DISCUSSION:
See HS295.3B
END_COMPOSITION_DISCUSSION.
See HS295.3B MICROSCOPIC_EXAMINATION:
See HS295.3B
END_MICROSCOPIC_EXAMINATION.
SPECTROSCOPIC_DISCUSSION:
Spectrum resembles that of Alunite HS295.3B at wavelengths shorter than 2.0 microns. Between 2 and 2.5 microns the alunite absorptions are modified by the muscovite so that the main 2.17 micron alunite band strongly resembles that of halloysite. The 1.76 and 2.32 micron alunite bands are still present. The presence of the 1.45 micron alunite OH stretch overtone doublet is still diagnostic of the presence of alunite.
END_SPECTROSCOPIC_DISCUSSION.
SPECTRAL_PURITY: 1a2_3_4_ # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns
See HS295.3B , CU91-250A
| LIB_SPECTRA_HED: | where | Wave Range | Av_Rs_Pwr | Comment |
|---|---|---|---|---|
| LIB_SPECTRA: | splib05a r 7274 | 0.2-3.0µm | 200 | g.s.= |
| LIB_SPECTRA: | splib06a r 23965 | g.s.= |