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(For further information on spectrsocopy, see:
http://speclab.cr.usgs.gov)
TITLE: Halloysite+Kaolinite CM29 DESCRIPT
DOCUMENTATION_FORMAT: MIXTURE
SAMPLE_ID: CM29
MIXTURE_TYPE: Intimate
MIXTURE: Halloysite + Kaolinite (Kaolinite-Serpentine group)
FORMULA: Al2Si2O5(OH)4
FORMULA_HTML: Al2Si2O5(OH)4
COLLECTION_LOCALITY: Wagon Wheel Gap, Colorado
ORIGINAL_DONOR: Clay Mineral Standard, Ward Natural Science Inc.
CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
SAMPLE_DESCRIPTION:
Polymorphous with Dickite, Kaolinite, and Nacrite.
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
Disordered kaolinite - a mixture of kaolinite and halloysite (from NIR data)] (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 | 43.8 | wt% | SiO2 |
| COMPOSITION: | TiO2 | less than 0.02 | wt% | TiO2 |
| COMPOSITION: | Al2O3 | 37.8 | wt% | Al2O3 |
| COMPOSITION: | Fe2O3 | 0.71 | wt% | Fe2O3 |
| COMPOSITION: | FeO | 0.03 | wt% | FeO |
| COMPOSITION: | MnO | less than 0.02 | wt% | MnO |
| COMPOSITION: | MgO | 0.11 | wt% | MgO |
| COMPOSITION: | CaO | 0.22 | wt% | CaO |
| COMPOSITION: | Na2O | less than 0.15 | wt% | Na2O |
| COMPOSITION: | K2O | less than 0.06 | wt% | K2O |
| COMPOSITION: | P2O5 | 0.21 | wt% | P2O5 |
| COMPOSITION: | H2O+ | 14.8 | wt% | H2O+ |
| COMPOSITION: | H2O- | 0.80 | wt% | H2O- |
| COMPOSITION: | H2O | 15.6 | wt% | H2O |
| COMPOSITION: | LOI | 15.4 | wt% | LOI |
| COMPOSITION: | Total | wt% | ||
| COMPOSITION: | O=Cl,F,S | wt% | #correction for Cl, F, S | |
| COMPOSITION: | New Total | wt% |
COMPOSITION_TRACE:
None
COMPOSITION_DISCUSSION:
Analysis by J. Taggart, Ardith J. Bartel, K. Stewart
Analysis by E. Brandt, J. H. Christie
Induced Coupled Plasma trace analysis exists but is not yet included.
END_COMPOSITION_DISCUSSION.
MICROSCOPIC_EXAMINATION:
average grain size = 300 µm
Sample is isotropic in cross-polarized light. Clumps of plates? visible under microscope. Plates suggest kaolinite, but SEM work I have done on this sample shows at least some grains are hollow tubes which indicates sample is partially halloysite. This sample is then probably a mix of kaolinite and halloysite. G. Swayze.
END_MICROSCOPIC_EXAMINATION.
SPECTROSCOPIC_DISCUSSION:
END_SPECTROSCOPIC_DISCUSSION.
SPECTRAL_PURITY: 1a2_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 1963 | 0.2-3.0µm | 200 | g.s.= |
| LIB_SPECTRA: | splib05a r 8294 | 0.2-3.0µm | 200 | g.s.= |
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