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(For further information on spectrsocopy, see:
http://speclab.cr.usgs.gov)
TITLE: Hectorite SHCa-1 DESCRIPT
DOCUMENTATION_FORMAT: MINERAL
SAMPLE_ID: SHCa-1
MINERAL_TYPE: Phyllosilicate
MINERAL: Hectorite (Montmorillonite group)
FORMULA: Na0.33(Mg,Li)3Si4O10(F,OH)2
FORMULA_HTML: Na0.33(Mg,Li)3Si4O10(F,OH)2
COLLECTION_LOCALITY: San Bernadino, California
ORIGINAL_DONOR: Grim Collection
CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
SAMPLE_DESCRIPTION:
Trioctahedral lithium montmorillonite (stored in H20).
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
Hectorite + quartz (m) + calcite (L) + dolomite (s)? (Norma Vergo)
END_XRD_ANALYSIS.
COMPOSITIONAL_ANALYSIS_TYPE: XRF # XRF, EM(WDS), ICP(Trace), WChem
| COMPOSITION KEYWORD |
Oxide ASCII |
Amount | Weight Percent, % |
Oxide html |
|---|---|---|---|---|
| COMPOSITION: | SiO2 | 34.7 | wt% | SiO2 |
| COMPOSITION: | TiO2 | 0.038 | wt% | TiO2 |
| COMPOSITION: | Al2O3 | 0.69 | wt% | Al2O3 |
| COMPOSITION: | Fe2O3 | 0.02 | wt% | Fe2O3 |
| COMPOSITION: | FeO | 0.25 | wt% | FeO |
| COMPOSITION: | MnO | 0.008 | wt% | MnO |
| COMPOSITION: | MgO | 15.3 | wt% | MgO |
| COMPOSITION: | CaO | 23.4 | wt% | CaO |
| COMPOSITION: | Li2O | 2.18 | wt% | Li2O |
| COMPOSITION: | Na2O | 1.26 | wt% | Na2O |
| COMPOSITION: | K2O | 0.13 | wt% | K2O |
| COMPOSITION: | P2O5 | 0.014 | wt% | P2O5 |
| COMPOSITION: | F | 2.60 | wt% | F |
| COMPOSITION: | F | 2.75 | wt% | F |
| COMPOSITION: | S | 0.01 | wt% | S |
| COMPOSITION: | LOI | 21.80 | wt% | LOI |
| COMPOSITION: | Total | 99.80 | wt% | |
| COMPOSITION: | O=Cl,F,S | wt% | #correction for Cl, F, S | |
| COMPOSITION: | New Total | wt% |
COMPOSITION_TRACE:
None
COMPOSITION_DISCUSSION:
None
END_COMPOSITION_DISCUSSION.
MICROSCOPIC_EXAMINATION:
Mode:
99 vol% hectorite
1 vol% quartz
trace opaques (metallic luster)
Bimodal Grain Size Distribution:
mode 1: 204 µm @ 80 vol%
mode 2: 25 µm @ 20 vol%
average grain size = 183 µm
Clay grains have sweeping extinction, quartz present but no evidence of calcite or dolomite. All consistent with a fairly pure sample of hectorite. G. Swayze.
END_MICROSCOPIC_EXAMINATION.
SPECTROSCOPIC_DISCUSSION:
END_SPECTROSCOPIC_DISCUSSION.
SPECTRAL_PURITY: 1c2_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 1974 | 0.2-3.0µm | 200 | g.s.= 183 µm |
| LIB_SPECTRA: | splib04a r 1985 | 0.2-3.0µm | 200 | g.s.= 183 µm |
| LIB_SPECTRA: | splib05a r 3112 | 0.2-3.0µm | 200 | g.s.= |
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