DOCUMENTATION_FORMAT: MINERAL
SAMPLE_ID: SWa-1
MINERAL_TYPE: Phyllosilicate
MINERAL: Nontronite (Fe-bearing Smectite) (Montmorillonite group)
FORMULA: Na0.33(Fe+3)2(Si,Al)4O10*nH20
FORMULA_HTML: Na 0.33Fe+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.
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
Analysis by Norma Vergo indicates the sample is Fe-smectite + small amounts of quartz, the <2µm cut was pure smectite.
END_XRD_ANALYSIS.
COMPOSITIONAL_ANALYSIS_TYPE: XRF # XRF, EM(WDS), ICP(Trace), WChem
| 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 | <0.02 | wt% | MnO |
| COMPOSITION: | MgO | 3.32 | wt% | MgO |
| COMPOSITION: | CaO | 1.88 | wt% | CaO |
| COMPOSITION: | Na2O | <0.15 | wt% | Na2O |
| COMPOSITION: | K2O | 0.03 | wt% | K2O |
| COMPOSITION: | P2O5 | <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: 1_2_3_4_
LIB_SPECTRA_HED: where Wave Range Av_Rs_Pwr Comment
LIB_SPECTRA: splib04a r 3516 0.2-3.0µm 200 g.s.=
LIB_SPECTRA: splib04a r 3527 0.2-3.0µm 200 g.s.=<2µm
LIB_SPECTRA: splib05a r ____ 0.2-3.0µm 200 g.s.=
LIB_SPECTRA: splib06a r ____ 1.5-25µm 250 g.s.=