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(For further information on spectroscopy, 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.= |
| LIB_SPECTRA: | splib06a r 25982 | g.s.= |