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(For further information on spectroscopy, see:
http://speclab.cr.usgs.gov)
TITLE: Montmorillonite STx-1 DESCRIPT
DOCUMENTATION_FORMAT: MINERAL
SAMPLE_ID: STx-1
MINERAL_TYPE: Phyllosilicate
MINERAL: Montmorillonite (Smectite) (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: Gonzales County, Texas
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.
IMAGE_OF_SAMPLE:
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: EM # XRF, EM(WDS), ICP(Trace), WChem
| COMPOSITION KEYWORD |
Oxide ASCII |
Amount | Weight Percent, % |
Oxide html |
|---|---|---|---|---|
| COMPOSITION: | SiO2 | 69.6 | wt% | SiO2 |
| COMPOSITION: | TiO2 | 0.29 | wt% | TiO2 |
| COMPOSITION: | Al2O3 | 16.3 | wt% | Al2O3 |
| COMPOSITION: | Fe2O3 | 1.17 | wt% | Fe2O3 |
| COMPOSITION: | FeO | 0.04 | wt% | FeO |
| COMPOSITION: | MnO | 0.01 | wt% | MnO |
| COMPOSITION: | MgO | 3.56 | wt% | MgO |
| COMPOSITION: | CaO | 1.73 | wt% | CaO |
| COMPOSITION: | Na2O | 0.33 | wt% | Na2O |
| COMPOSITION: | K2O | 0.15 | wt% | K2O |
| COMPOSITION: | P2O5 | 0.03 | wt% | P2O5 |
| COMPOSITION: | F | 0.084 | wt% | F |
| COMPOSITION: | CO2 | 0.16 | wt% | CO2 |
| COMPOSITION: | LOI | 7.50 | wt% | LOI |
| COMPOSITION: | Total | 100.87 | wt% | |
| COMPOSITION: | O=Cl,F,S | wt% | #correction for Cl, F, S | |
| COMPOSITION: | New Total | wt% |
COMPOSITION_TRACE:
COMPOSITION_DISCUSSION:
Analysis by C. V. Clemency, Dept. of Geological Sciences, SUNY at Buffalo, Buffalo NY for the Clay Minerals Society. Fluorine analysis by J. Thomas Jr., Illinois State Geological Survey, Urbana, Ill, and is not included in the total.
Published in: van Olphen, H. and J.J. Fripiat, eds., 1979, Data handbook for clay materials and other non-metallic minerals, Pergamon Press, New York, p128.
END_COMPOSITION_DISCUSSION.
MICROSCOPIC_EXAMINATION:
Trace amounts of opaques, no HCl fizz.
END_MICROSCOPIC_EXAMINATION.
SPECTROSCOPIC_DISCUSSION:
END_SPECTROSCOPIC_DISCUSSION.
SPECTRAL_PURITY: 1b2b3b4_ # 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 3202 | 0.2-3.0µm | 200 | g.s.= |
| LIB_SPECTRA: | splib05a r 4593 | 0.2-3.0µm | 200 | g.s.= |
| LIB_SPECTRA: | splib06a r 14630 | g.s.= | ||
| LIB_SPECTRA: | splib06a r 14644 | g.s.= |