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(For further information on spectrsocopy, see:
http://speclab.cr.usgs.gov)
TITLE: Halloysite CM13 DESCRIPT
DOCUMENTATION_FORMAT: MINERAL
SAMPLE_ID: CM13
MINERAL_TYPE: Phyllosilicate
MINERAL: Halloysite (Kaolinite-Serpentine group)
FORMULA: Al2Si2O5(OH)4
FORMULA_HTML: Al2Si2O5(OH)4
COLLECTION_LOCALITY: Dragon Iron Mine, Eureka, Utah
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.
A spectrum for this sample was published by:
Clark, R.N., King, T.V.V., Klejwa, M., Swayze, G.A., and Vergo, N., 1990, High spectral resolution reflectance spectroscopy of minerals: Journal of Geophysical Research, v.g 95, no. 8B, p 12,653-12,680.
Who noted that the sample was spectrally pure.
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
Halloysite + quartz
less than 2µ 7A halloysite + smectite + trace 10A halloysite.
Spectrally pure. (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 | 46.3 | wt% | SiO2 |
| COMPOSITION: | TiO2 | 0.11 | wt% | TiO2 |
| COMPOSITION: | Al2O3 | 35.2 | wt% | Al2O3 |
| COMPOSITION: | Fe2O3 | 0.72 | wt% | Fe2O3 |
| COMPOSITION: | FeO | 0.02 | wt% | FeO |
| COMPOSITION: | MnO | less than 0.02 | wt% | MnO |
| COMPOSITION: | MgO | 0.31 | wt% | MgO |
| COMPOSITION: | CaO | 0.31 | wt% | CaO |
| COMPOSITION: | Na2O | less than 0.15 | wt% | Na2O |
| COMPOSITION: | K2O | less than 0.02 | wt% | K2O |
| COMPOSITION: | P2O5 | 0.26 | wt% | P2O5 |
| COMPOSITION: | H2O+ | 14.4 | wt% | H2O+ |
| COMPOSITION: | H2O- | 1.80 | wt% | H2O- |
| COMPOSITION: | H2O | 16.2 | wt% | H2O |
| COMPOSITION: | LOI | 15.8 | 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:
Bimodal Grain Size Distribution:
mode 1: 670 µm @ 95 vol%
mode 2: 35 µm @ 5 vol%
avg. grain size = 650 µm
Sample is not isotropic under cross-polarized light. About 1 vol% of sample has iron-oxide staining. Larger grains are 50% coated with smaller grains. Because sample is not isotropic I think sample has other clay contaminants probably up to 50 vol%. G. Swayze.
END_MICROSCOPIC_EXAMINATION.
SPECTROSCOPIC_DISCUSSION:
END_SPECTROSCOPIC_DISCUSSION.
SPECTRAL_PURITY: 1b2_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 1942 | 0.2-3.0µm | 200 | g.s.= 650 µm |
| LIB_SPECTRA: | splib05a r 3028 | 0.2-3.0µm | 200 | g.s.= |
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