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(For further information on spectroscopy, see:
http://speclab.cr.usgs.gov)
TITLE: Montmorillonite+Illite CM37 DESCRIPT
DOCUMENTATION_FORMAT: MIXTURE
SAMPLE_ID: CM37
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: Strasburg, Virginia
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.
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
Analysis by Norma Vergo indicates the sample is clay + quartz + calcite + trace feldspar? The less than 2µm cut has illite/smectite 96%, illite + trace amounts of quartz.
END_XRD_ANALYSIS.
COMPOSITIONAL_ANALYSIS_TYPE: XRF # XRF, EM(WDS), ICP(Trace), WChem
| COMPOSITION KEYWORD |
Oxide ASCII |
Amount | Weight Percent, % |
Oxide html |
|---|---|---|---|---|
| COMPOSITION: | SiO2 | 46.5 | wt% | SiO2 |
| COMPOSITION: | TiO2 | 1.05 | wt% | TiO2 |
| COMPOSITION: | Al2O3 | 22.7 | wt% | Al2O3 |
| COMPOSITION: | Fe2O3 | 3.19 | wt% | Fe2O3 |
| COMPOSITION: | FeO | 0.29 | wt% | FeO |
| COMPOSITION: | MnO | less than 0.02 | wt% | MnO |
| COMPOSITION: | MgO | 2.74 | wt% | MgO |
| COMPOSITION: | CaO | 5.86 | wt% | CaO |
| COMPOSITION: | Na2O | 0.31 | wt% | Na2O |
| COMPOSITION: | K2O | 5.92 | wt% | K2O |
| COMPOSITION: | P2O5 | 0.12 | wt% | P2O5 |
| COMPOSITION: | H2O+ | 6.18 | wt% | H2O+ |
| COMPOSITION: | H2O- | 1.52 | wt% | H2O- |
| COMPOSITION: | H2O | 7.70 | wt% | H2O |
| COMPOSITION: | LOI | 11.2 | wt% | LOI |
| COMPOSITION: | Total | 99.61 | 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 3213 | 0.2-3.0µm | 200 | g.s.= |
| LIB_SPECTRA: | splib05a r 8631 | 0.2-3.0µm | 200 | g.s.= |
| LIB_SPECTRA: | splib06a r 25969 | g.s.= |