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(For further information on spectrsocopy, see:
http://speclab.cr.usgs.gov)
TITLE: Alunite AL706 DESCRIPT
DOCUMENTATION_FORMAT: MINERAL
SAMPLE_ID: AL706
MINERAL_TYPE: Sulfate
MINERAL: Alunite (Alunite group)
FORMULA: (Na,K)Al3(SO4)2(OH)6
FORMULA_HTML: (Na,K)Al3(SO4)2(OH)6
COLLECTION_LOCALITY: Sulfur, Nevada
ORIGINAL_DONOR: Ron Lyon, Stanford University
CURRENT_SAMPLE_LOCATION: CSES/CIRES, Univ. of CO, Boulder
ULTIMATE_SAMPLE_LOCATION: CSES/CIRES, Univ. of CO, Boulder
SAMPLE_DESCRIPTION:
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
Alunite
Contaminant phases: smectite, quartz, minor amounts.
Kruse, F.A., and P.L. Hauff, eds., 1992, The IGCP-264 Spectral Properties Database. IUSG/UNESCO, Special Publication, 211p., (in press).
END_XRD_ANALYSIS.
COMPOSITIONAL_ANALYSIS_TYPE: None # XRF, EM(WDS), ICP(Trace), WChem
COMPOSITION_TRACE: None
COMPOSITION_DISCUSSION:
END_COMPOSITION_DISCUSSION.
MICROSCOPIC_EXAMINATION:
avg. grain size = 15 µm
Length fast, 1st order gray, sample looks pure but small grain size prevents
determination of optical sign. G. Swayze.
END_MICROSCOPIC_EXAMINATION.
SPECTROSCOPIC_DISCUSSION:
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: | splib04a r 239 | 0.2-3.0µm | 200 | g.s.= |
| LIB_SPECTRA: | splib05a r 269 | 0.2-3.0µm | 200 | g.s.= |
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