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(For further information on spectrsocopy, see:
http://speclab.cr.usgs.gov)
TITLE: Alunite RES-3 Na Syn (450C) DESCRIPT
DOCUMENTATION_FORMAT: Synthetic
SAMPLE_ID: RES-3
MINERAL_TYPE: Sulfate
MINERAL: Na-Alunite (Alunite Group)
FORMULA: NaAl3(SO4)2(OH)6
FORMULA_HTML: NaAl3(SO4)2(OH)6
COLLECTION_LOCALITY: Not available
ORIGINAL_DONOR: Roger Stoffregen
CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
SAMPLE_DESCRIPTION:
Synthetically prepared pure Na-endmember sample made at 450C. Sample composition is 100% mole fraction Na.
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.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_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, 2.17, 2.32, and 2.5 microns. Other pure Na-endmember alunites prepared at lower temperatures have much weaker vibrational features.
END_SPECTROSCOPIC_DISCUSSION.
SPECTRAL_PURITY: 1a2_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 626 | 1.3-5.3µm | 200 | g.s.= |
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