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(For further information on spectroscopy, see:
http://speclab.cr.usgs.gov)
TITLE: Goethite Phyllite CU91-236A DESCRIPT
DOCUMENTATION_FORMAT: MIXTURE
SAMPLE_ID: CU91-236A
MIXTURE_TYPE: Intimate
MIXTURE: Goethite + other mineral phases
FORMULA: alpha-Fe3+O(OH)
FORMULA_HTML: alpha-Fe3+O(OH)
COLLECTION_LOCALITY: Western Alteration Center, Cuprite, Nevada, USA
ORIGINAL_DONOR: Gregg Swayze
COLLECTION_LATITUDE: N37 32.53' # degrees and decimal minutes (N or S)
COLLECTION_LONGITUDE: W117 13.40' # degrees and decimal minutes (W or E)
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 consists of goethite rich altered lower Cambrian Harkless phyllite involved in hydothermal alteration about 7.5 Ma in the now relict western center hydrothermal center at Cuprite, NV. The sample was collected in the central part of the western center along its western margin.
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
Goethite, kaolinite, and quartz.
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 goethite. There is a broad Fe band at 0.9770 microns. Kaolinite is evident from doublets near 1.4 and 2.2 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history of the Cuprite Mining District, southwestern Nevada: an integrated geological and geophysical approach: unpublished Ph.D. Dissertation, University of Colorado at Boulder, 399p.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 8179 | 0.2-3.0µm | 200 | g.s.= |
| LIB_SPECTRA: | splib06a r 25213 | g.s.= |