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+Chlorite CU91-253D DESCRIPT

DOCUMENTATION_FORMAT: MIXTURE

SAMPLE_ID: CU91-253D

MIXTURE_TYPE: Intimate

MIXTURE: Chlorite and Muscovite in a Phyllite

FORMULA: (Mg,Fe)3(Si,Al)4O10(OH)2-(Mg,Fe)3(OH)6 and (Fe3+,Mg,Al,Fe2+,Ti,Mn)2.42(SiAl)2O5(OH)4

FORMULA_HTML: (Mg,Fe)₃(Si,Al)₄O₁₀(OH)₂-(Mg,Fe)₃(OH)₆
and (Fe3+Mg,Al,Fe2+,Ti,Mn)_2.42(SiAl)₂O₅(OH)₄

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:

Sample is a Chlorite - Muscovite phyllite from the Lower Cambrian Harkless Formation collected west of hwy 95 from south of the western relict hydrothermal center. This sample is from outside of the alteration zone and is representative of the regionally metamorphosed Harkless Formation.

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

none

END_XRD_ANALYSIS.

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

COMPOSITION_TRACE: None

COMPOSITION_DISCUSSION:

none

END_COMPOSITION_DISCUSSION.

MICROSCOPIC_EXAMINATION:

none

END_MICROSCOPIC_EXAMINATION.

SPECTROSCOPIC_DISCUSSION:

Spectrum is dominated by Fe-related Chlorite absorptions in the electronic portion of the spectrum (.2 - 1.35 microns) and dominated by both muscovite and chlorite absorptions in the vibrational region (1.35 - 2.5 microns). There is a Al-OH combination band from Al-rich muscovite at 2.1970 microns. Bands at 2.2596 and 2.3461 microns are due to chlorite.

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 8723	1.3-5.3µm	200	g.s.=
LIB_SPECTRA:	splib06a r 26061			g.s.=