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(For further information on spectrsocopy, see:
http://speclab.cr.usgs.gov)
TITLE: Alunite RES-9 Summitv (400C) DESCRIPT
DOCUMENTATION_FORMAT: MINERAL
SAMPLE_ID: RES-9
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: Summitville, Colorado, USA
ORIGINAL_DONOR: Roger Stoffregen
CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
SAMPLE_DESCRIPTION:
Alunite RES-9 (Na40) Sample is from the Summitville Mine in SW Colorado, probably from drill core samples. Sample composition is 40 mole % Na from atomic absorption analysis. See: Stoffregen, R.E., and C.N. Alpers, Observations on the unit-cell dimensions, H2O contents, and delD values of natural and synthetic alunite, American Mineralogist, 77, 1092-1098, 1992.
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
see: Stoffregen, R., and Alpers, C., 1992, Observations on the unit-cell dimensions, H2O contents and del D values of natural and synthetic alunite: American Mineralogist, v.77, p. 1092-1098.
END_XRD_ANALYSIS.
COMPOSITIONAL_ANALYSIS_TYPE: NONE #XRF, EM(WDS), ICP(Trace),WChem
COMPOSITION_TRACE: None
COMPOSITION_DISCUSSION:
END_COMPOSITION_DISCUSSION.
MICROSCOPIC_EXAMINATION:
END_MICROSCOPIC_EXAMINATION.
SPECTROSCOPIC_DISCUSSION:
Sample has relatively strong vibrational features between 1.4 - 1.5, 1.76, and 2.0 - 2.24, 2.32, and a complex centered at 2.5 microns.
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 702 | 1.3-5.3µm | 200 | g.s.= |
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