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(For further information on spectroscopy, see:
http://speclab.cr.usgs.gov)
TITLE: Medlow Al-muscovite CU91-250A DESCRIPT
DOCUMENTATION_FORMAT: MIXTURE
SAMPLE_ID: CU91-250A
MIXTURE_TYPE: Intimate
MIXTURE: Medlow Al-muscovite + quartz
FORMULA: KAl2(Si3Al)O10(OH,F)2 + SiO2
FORMULA_HTML: KAl2(Si3Al)O10(OH,F)2 + SiO2
COLLECTION_LOCALITY: Western Alteration Center, Cuprite, Nevada, USA
ORIGINAL_DONOR: Gregg Swayze
COLLECTION_LATITUDE: N37 31.77' # degrees and decimal minutes (N or S)
COLLECTION_LONGITUDE: W117 13.52' # degrees and decimal minutes (W or E) P> DATUM: NAD27 # coordinate datum
CURRENT_SAMPLE_LOCATION: U.S.G.S. Denver Spectroscopy Laboratory
ULTIMATE_SAMPLE_LOCATION: U.S.G.S. Denver Spectroscopy Laboratory
SAMPLE_DESCRIPTION:
This sample was collected from the very southwestern margin of the western alteration center from the lower Cambrian Harkless Phyllite which was hydrothermally altered about 7.5 Ma.
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
Quartz (major), muscovite (both 2M1 and 1M polytypes).
END_XRD_ANALYSIS.
COMPOSITIONAL_ANALYSIS_TYPE: XRF # XRF, EM(WDS), ICP(Trace), WChem
COMPOSITION_TRACE: None
COMPOSITION_DISCUSSION:
None
END_COMPOSITION_DISCUSSION.
MICROSCOPIC_EXAMINATION:
None
END_MICROSCOPIC_EXAMINATION.
SPECTROSCOPIC_DISCUSSION:
The spectrum has absorptions characteristic of muscovite with the 1st OH overtone at 1.4108 microns and Al-OH combination band at 2.2040 microns, plus iron-oxide absorption bands at 0.5 and 0.8 microns.
See: Swayze, G.A., 1997, The hydrothermal and structural history of the Cuprite Mining District, southwestern Nevada: an integrated geological and geophysical approach: unpublished Ph.D. Dissertation, University of Colorado at Boulder, 399p.
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 8828 | 0.2-3.0µm | 200 | g.s.= |
| LIB_SPECTRA: | splib06a r 26166 | g.s.= |