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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: Pyrophyl.50+Ca-Mont.50 AMX16 DESCRIPT

DOCUMENTATION_FORMAT: Mixture

SAMPLE_ID: AMX16

MIXTURE_TYPE: Areal

MIXTURE: 50% pyrophyllite PYS1A and 50% Ca-Montmorillonite SAz-1

FORMULA: Al2Si4O10(OH)2 and (Ca)0.33(Al,Mg)2Si4O10(OH)2*nH2O

FORMULA_HTML: Al2Si4O10(OH)2 and
(Ca)0.33(Al,Mg)2Si4O10(OH)2•nH2O

COLLECTION_LOCALITY: (Staley, NC.), (Apache County, Arizona).

ORIGINAL_DONOR: (Bruce Hemingway), (Clay Mineral Society).

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: USGS Denver Spectroscopy Laboratory, Denver, Colorado

ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory, Denver, Colorado

SAMPLE_DESCRIPTION:

Areal mixture of 50% pyrophyllite PYS1A and 50% Ca-Montmorillonite SAz-1 calculated from pure endmember spectra of these minerals.

See PYS1A, SAz-1

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

See pyrophyllite PYS1A and Ca-montmorillonite SAz-1

see:

END_XRD_ANALYSIS.

COMPOSITIONAL_ANALYSIS_TYPE: EM(WDS) # XRF, EM(WDS), ICP(Trace), WChem

See PYS1A, SAz-1

COMPOSITION_TRACE: None

COMPOSITION_DISCUSSION:

See PYS1A, SAz-1

END_COMPOSITION_DISCUSSION.

MICROSCOPIC_EXAMINATION:

See PYS1A, SAz-1

END_MICROSCOPIC_EXAMINATION.

SPECTROSCOPIC_DISCUSSION:

Spectrum has absorption characteristic of both mineral phases. Their absorptions overlap in the 1.4 micron region but are separate in the 2.2 micron region.

END_SPECTROSCOPIC_DISCUSSION.

SPECTRAL_PURITY: 1a2_3_4_ # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns

See PYS1A, SAz-1

LIB_SPECTRA_HED: where Wave Range Av_Rs_Pwr Comment
LIB_SPECTRA: splib05a r 8954 0.2-3.0µm 200 g.s.=


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