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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: Water+Montmor SWy-2 DESCRIPT

DOCUMENTATION_FORMAT: VOLATILE

SAMPLE_ID: Not Available

MATERIAL_TYPE: Oxide and Phyllosilicate

MATERIAL: Water and Phyllosilicate (Clay) Mineral

FORMULA: H2O + (Na,Ca)0.33(Al,Mg)2Si4O10(OH)2*nH20

FORMULA_HTML: H2O + (Na,Ca)0.33(Al,Mg)2Si4O10(OH)2•nH20

COLLECTION_LOCALITY: Not Applicable

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

ORIGINAL_DONOR: Roger Clark

CURRENT_SAMPLE_LOCATION: Not Available

ULTIMATE_SAMPLE_LOCATION: Not Available

SAMPLE_DESCRIPTION:

Water + montmorillonite SWy-2. SWy-2 is a Source Clay Minerals purchased sample and is from the same location as montmorillonite SWy-1, being a newer sampling of the deposit. See the montmorillonite SWy-1 sample description.

The montmorillonite SWy-2 was mixed with water.n various proportions. The mixture was actively stirred and spectra measured while the mix was still moving to minimize settling effects. Montmorillonite was added in the following proportions: 0.5, 1.67, 5.01, and 16.7 grams of montmorillonite per liter of distilled water. The 3 lower abundance montmorillonite mixtures were measured in a 17.5 cm diameter by 22 cm deep black plastic container, ensuring an optically thick path. The highest concentration was more like a paste and was measured in a 3 cm diameter by 5 cm deep black plastic film canister.

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

Not Available

END_XRD_ANALYSIS.

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

COMPOSITION_TRACE: None

COMPOSITION_DISCUSSION:

END_COMPOSITION_DISCUSSION.

MICROSCOPIC_EXAMINATION:

END_MICROSCOPIC_EXAMINATION.

IMAGE_OF_SAMPLE: Not Available

SPECTROSCOPIC_DISCUSSION:

Spectra are dominated by liquid water absorptions in the near infrared and by the montmorillonite reflectance in the visible to ultraviolet.

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 9638 0.2-3.0µm 200 g.s.=
LIB_SPECTRA: splib05a r 9664 0.2-3.0µm 200 g.s.=
LIB_SPECTRA: splib05a r 9689 0.2-3.0µm 200 g.s.=
LIB_SPECTRA: splib05a r 9713 0.2-3.0µm 200 g.s.=


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