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Clark et. al. 2003 USGS Open File Report 03-395
Spectral Library splib05a Sample Description

(For further information on spectrsocopy, see: http://speclab.cr.usgs.gov)

TITLE: Chlor+Goethite CU93-4B Phyl DESCRIPT

DOCUMENTATION_FORMAT: MIXTURE

SAMPLE_ID: CU93-4B

MIXTURE_TYPE: Intimate

MIXTURE: Chlorite and Goethite

FORMULA: (Mg,Fe)3(Si,Al)4O10(OH)2-(Mg,Fe)3(OH)6 and alpha-Fe3+O(OH)

FORMULA_HTML: (Mg,Fe)3(Si,Al)4O10(OH)2-(Mg,Fe)3 and alpha-Fe3+O(OH)

COLLECTION_LOCALITY: Cuprite, Nevada, USA

ORIGINAL_DONOR: Gregg Swayze

COLLECTION_LATITUDE: Not Available # degrees and decimal minutes (N or S)

COLLECTION_LONGITUDE: Not Available # degrees and decimal minutes (W or E)

DATUM: Not Available # coordinate datum

CURRENT_SAMPLE_LOCATION: U.S.G.S. Denver Spectroscopy Laboratory

ULTIMATE_SAMPLE_LOCATION: U.S.G.S. Denver Spectroscopy Laboratory

SAMPLE_DESCRIPTION:

Goethite coated Chlorite Phyllite. Part of lower Cambrian Harkless Phyllite that was altered around 7.0 Ma by hydrothermal fluids. Sample is from the core propylitic zone of the western hydrothermal center.

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

none

END_XRD_ANALYSIS.

COMPOSITIONAL_ANALYSIS_TYPE: NONE # XRF, EM(WDS), ICP(Trace),WChem

COMPOSITION_TRACE: None

COMPOSITION_DISCUSSION:

none

END_COMPOSITION_DISCUSSION.

MICROSCOPIC_EXAMINATION:

none

END_MICROSCOPIC_EXAMINATION.

SPECTROSCOPIC_DISCUSSION:

Spectrum is that of goethite and chlorite with possibly a trace of muscovite as indicated by the weak absorption at 2.2045 microns. Goethite absorptions superimposed on those of chlorite in the electronic region (0.35 to 1.35 microns). Sample may contain magnetite which may depress the overall spectral level.

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 7802 0.2-3.0µm 200 g.s.=


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