DOCUMENTATION_FORMAT: MINERAL
SAMPLE_ID: CM37
MINERAL_TYPE: Phyllosilicate
MINERAL: 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 <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: | 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 | <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: 1_2_3_4_
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 ____ 0.2-3.0µm 200 g.s.=
LIB_SPECTRA: splib06a r ____ 1.5-25µm 250 g.s.=