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DOCUMENTATION_FORMAT: MINERAL
SAMPLE_ID: SWa-1.a, SWa-1.b
MINERAL_TYPE: Phyllosilicate
MINERAL: Nontronite (Fe-bearing Smectite) (Montmorillonite group)
FORMULA: Na0.33(Fe+3)2(Si,Al)4O10*nH20
FORMULA_HTML: Na0.33Fe+32(Si,Al)4O10•nH2O
COLLECTION_LOCALITY: Grant County, Washington
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.
Grain size fractions are indicated by the extension after the sample number:
.a = bulk
.b = less than 2µm
IMAGE_OF_SAMPLE:
NO PHOTO
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
Analysis by Norma Vergo indicates the sample is Fe-smectite + small amounts of quartz, the less than 2µm cut was pure smectite.
END_XRD_ANALYSIS.
COMPOSITIONAL_ANALYSIS_TYPE: XRF # XRF, EPMA, ICP(Trace), WChem
| COMPOSITION KEYWORD |
Oxide ASCII |
Amount | Weight Percent, % |
Oxide html |
|---|---|---|---|---|
| COMPOSITION: | SiO2 | 47.6 | wt% | SiO2 |
| COMPOSITION: | TiO2 | 0.54 | wt% | TiO2 |
| COMPOSITION: | Al2O3 | 7.69 | wt% | Al2O3 |
| COMPOSITION: | Fe2O3 | 23.0 | wt% | Fe2O3 |
| COMPOSITION: | FeO | 0.05 | wt% | FeO |
| COMPOSITION: | MnO | less than 0.02 | wt% | MnO |
| COMPOSITION: | MgO | 3.32 | wt% | MgO |
| COMPOSITION: | CaO | 1.88 | wt% | CaO |
| COMPOSITION: | Na2O | less than 0.15 | wt% | Na2O |
| COMPOSITION: | K2O | 0.03 | wt% | K2O |
| COMPOSITION: | P2O5 | less than 0.05 | wt% | P2O5 |
| COMPOSITION: | H2O+ | 6.32 | wt% | H2O+ |
| COMPOSITION: | H2O- | 11.9 | wt% | H2O- |
| COMPOSITION: | H2O | 18.2 | wt% | H2O |
| COMPOSITION: | LOI | 17.9 | wt% | LOI |
| COMPOSITION: | Total | 100.60 | wt% | |
| COMPOSITION: | O=Cl,F,S | wt% | #correction for Cl, F, S | |
| COMPOSITION: | New Total | 100.60 | 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: 1b2b3b4b # SWa-1.a # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns
SPECTRAL_PURITY: 1a2a3a4_ # SWa-1.b # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns