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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: Montmorillonite+Illite CM42 DESCRIPT

DOCUMENTATION_FORMAT: MIXTURE

SAMPLE_ID: CM42

MIXTURE_TYPE: Intimate

MIXTURE: Montmorillonite + Illite (Metabentonite) (Montmorillonite group)

FORMULA: (Na,Ca)0.33(Al,Mg)2Si4O10(OH)2*nH20 + (K,H3O)(Al,Mg,Fe)2(Si,Al)4O10[(OH)2,H2O]

FORMULA_HTML: (Na,Ca)0.33(Al,Mg)2Si4O10(OH)2•nH2O + (K,H3O)(Al,Mg,Fe)2(Si,Al)4O10[(OH)2,H2O]

COLLECTION_LOCALITY: Highbridge, Kentucky

ORIGINAL_DONOR: Clay Mineral Standard, Wards Natural Science Inc

CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

SAMPLE_DESCRIPTION:

Sample is tan in color.
Note: The absorption band at .9 µm may be due to Fe-bearing illite.

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

Analysis by Norma Vergo indicates the sample is clay + quartz + others. The less than 2µm cut has quartz, R1, illite/smectite layers, 70% illite.

END_XRD_ANALYSIS.

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


COMPOSITION
KEYWORD
Oxide
ASCII
Amount Weight
Percent, %
Oxide
html
COMPOSITION: SiO2 54.8 wt% SiO2
COMPOSITION: TiO2 0.28 wt% TiO2
COMPOSITION: Al2O3 21.0 wt% Al2O3
COMPOSITION: Fe2O3 1.75 wt% Fe2O3
COMPOSITION: FeO 0.05 wt% FeO
COMPOSITION: MnO less than 0.02 wt% MnO
COMPOSITION: MgO 3.40 wt% MgO
COMPOSITION: CaO 1.52 wt% CaO
COMPOSITION: Na2O less than 0.15 wt% Na2O
COMPOSITION: K2O 6.73 wt% K2O
COMPOSITION: P2O5 0.33 wt% P2O5
COMPOSITION: H2O+ 5.52 wt% H2O+
COMPOSITION: H2O- 4.92 wt% H2O-
COMPOSITION: H2O 10.4 wt% H2O
COMPOSITION: LOI 10.1 wt% LOI
COMPOSITION: Total 100.08 wt%
COMPOSITION: O=Cl,F,S wt% #correction for Cl, F, S
COMPOSITION: New Total wt%

COMPOSITION_TRACE:

COMPOSITION_DISCUSSION:

XRF Analysis by Branch of Analytical Chemistry, USGS, Denver. Total above includes LOI value rather than H2O values, and does not include value for FeO as it was determined at same time as H2O. Trace analysis was performed and will be added later.

END_COMPOSITION_DISCUSSION.

MICROSCOPIC_EXAMINATION:

END_MICROSCOPIC_EXAMINATION.

SPECTROSCOPIC_DISCUSSION:

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: splib04a r 3224 0.2-3.0µm 200 g.s.=
LIB_SPECTRA: splib05a r 8644 0.2-3.0µm 200 g.s.=


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