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: Muscovite CU98-8H low-Al + quartz DESCRIPT

DOCUMENTATION_FORMAT: MIXTURE

SAMPLE_ID: CU98-8H

MIXTURE_TYPE: Intimate

MIXTURE: Muscovite low-Al + 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 33.513' # degrees and decimal minutes (N or S)

COLLECTION_LONGITUDE: W117 12.990' # 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 northern end of the western alteration center at Cuprite, NV. Sample was collected from unaltered lower Cambrian Harkless Phyllite.

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

Quartz (major), muscovite (both 1M and 2M1 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 1.4120 microns and Al-OH combination band at 2.2070 microns. Bands in the electronic region (0.35- 1.35 microns) indicate that the sample is probably coated with goethite.

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history of the Cuprite Mining District, southwestern Nevada: an integrated geological and geophysical approach: unpublished Ph.D. Dissertation, University of Colorado at Boulder, 399p.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 8783	0.2-3.0µm	200	g.s.=
LIB_SPECTRA:	splib06a r 26121			g.s.=