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(For further information on spectrsocopy, see:
http://speclab.cr.usgs.gov)
TITLE: Montmorillonite SCa-2 DESCRIPT
DOCUMENTATION_FORMAT: MINERAL
SAMPLE_ID: SCa-2
MINERAL_TYPE: Phyllosilicate
MINERAL: Montmorillonite (Montmorillonite group)
FORMULA: (Na,Ca)0.33(Al,Mg)2Si4O10(OH)2*nH20
FORMULA_HTML: (Na,Ca)0.33(Al,Mg)2Si4O10(OH)2•nH20
COLLECTION_LOCALITY: San Diego County, CA
ORIGINAL_DONOR: Clay Mineral Society
CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
SAMPLE_DESCRIPTION:
A spectrum for this sample was published by:
Clark, R.N., T.V.V. King, M. Klejwa, G. Swayze, and N. Vergo, 1990, High spectral resolution reflectance spectroscopy of minerals: J. Geophys Res. 12653-12680.
who noted that it was spectrally pure.
The spectrum from 2.5-25µm was published in: Salisbury, J. W., Walter, L. W., and Vergo, N., 1987, Mid-Infrared (2.1-25µm) Spectra of Minerals: First Edition, U.S. Geological Survey Open File Report 87-263.
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
Analysis by Norma Vergo indicates the sample is smectite + trace amounts of quartz, the less than 2µm cut is pure smectite.
END_XRD_ANALYSIS.
COMPOSITIONAL_ANALYSIS_TYPE: XRF # XRF, EM(WDS), ICP(Trace), WChem
| COMPOSITION KEYWORD |
Oxide ASCII |
Amount | Weight Percent, % |
Oxide html |
|---|---|---|---|---|
| COMPOSITION: | SiO2 | 52.4 | wt% | SiO2 |
| COMPOSITION: | TiO2 | 0.32 | wt% | TiO2 |
| COMPOSITION: | Al2O3 | 15.0 | wt% | Al2O3 |
| COMPOSITION: | Fe2O3 | 1.75 | wt% | Fe2O3 |
| COMPOSITION: | FeO | less than 0.01 | wt% | FeO |
| COMPOSITION: | MnO | 0.16 | wt% | MnO |
| COMPOSITION: | MgO | 6.68 | wt% | MgO |
| COMPOSITION: | CaO | 0.81 | wt% | CaO |
| COMPOSITION: | Na2O | 1.21 | wt% | Na2O |
| COMPOSITION: | K2O | 0.33 | wt% | K2O |
| COMPOSITION: | P2O5 | 0.05 | wt% | P2O5 |
| COMPOSITION: | H2O+ | 6.78 | wt% | H2O+ |
| COMPOSITION: | H2O- | 12.5 | wt% | H2O- |
| COMPOSITION: | H2O | 19.3 | wt% | H2O |
| COMPOSITION: | LOI | 19.5 | wt% | LOI |
| COMPOSITION: | Total | 98.21 | 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:
~1% opaques.
END_MICROSCOPIC_EXAMINATION.
SPECTROSCOPIC_DISCUSSION:
END_SPECTROSCOPIC_DISCUSSION.
SPECTRAL_PURITY: 1b2_3_4_ # SCa-2.a # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns
SPECTRAL_PURITY: 1a2_3_4_ # SCa-2.b # 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 3144 | 0.2-3.0µm | 200 | g.s.= |
| LIB_SPECTRA: | splib04a r 3155 | 0.2-3.0µm | 200 | g.s.= <2µm |
| LIB_SPECTRA: | splib05a r 4566 | 0.2-3.0µm | 200 | g.s.= |
| LIB_SPECTRA: | splib05a r 4580 | 0.2-3.0µm | 200 | g.s.= |
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