Clark and others 2007 USGS Data Series 231
Spectral Library splib06a Sample Description

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

TITLE: Dickite + others CU91-219B DESCRIPT

DOCUMENTATION_FORMAT: MIXTURE

SAMPLE_ID: CU91-219B

MIXTURE_TYPE: Intimate

MIXTURE: Dickite, Kaolinite, Quartz, Calcite

FORMULA: Al2Si2O5(OH)4, Al2Si2O5(OH)4, SiO2, CaCO3

FORMULA_HTML: Al₂Si₂O₅(OH)₄ Al₂Si₂O₅(OH)₄ SiO₂, CaCO₃

COLLECTION_LOCALITY: Eastern Alteration Center, Cuprite, Nevada, USA

ORIGINAL_DONOR: Gregg Swayze

COLLECTION_LATITUDE: N37 31.90' # degrees and decimal minutes (N or S)

COLLECTION_LONGITUDE: W117 13.30' # 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 southwestern portion of the western alteration center at Cuprite, NV and is composed of hydrothermally altered lower Cambrian Harkless Phyllite altered during a 7.5 Ma hydrothermal event.

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

Dickite plus some solid solution with kaolinite, quartz, and calcite.

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 doesn't include the spectral range from 0.35-1.35 microns. The spectral absorptions are characteristic of dickite with strong doublets in the 1.4 and 2.2 micron region.

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history of the Cuprite Mining District, southwestern Nevada: an integrated geological and geophysical approach: unpublished Ph.D. Dissertation, University of Colorado at Boulder, 399p.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: 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 8030	1.3-5.3µm	200	g.s.=
LIB_SPECTRA:	splib06a r 24979			g.s.=