DOCUMENTATION_FORMAT: MINERAL
SAMPLE_ID: IMt-1
MINERAL_TYPE: Phyllosilicate
MINERAL: Illite, a group of hydrated mica-clay minerals
FORMULA: (K,H3O)(Al,Mg,Fe)2(Si,Al)4O10[(OH)2,H2O]
FORMULA_HTML: (K,H3O)(Al,Mg,Fe)2(Si,Al)4O10[(OH)2,H2O]
COLLECTION_LOCALITY: Silver Hill, Montana
ORIGINAL_DONOR: Clay Mineral Society Source Clay Mineral Repository
CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
SAMPLE_DESCRIPTION:
A spectrum of 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. Samples measured for the library include bulk (a) and <2µm fraction (b).
The spectrum from 2.5 to 25µm for this sample was published in:
Salisbury, J. W., Walter, L. W., and Vergo, N., 1987, Mid-Infrared (2.1-25µm) Spectra of Minerals: First Edition, U.S. Geological Survey Open File Report 87-263.
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
Analysis by Norma Vergo indicates that the bulk sample is illite + quartz, <2µm separate is pure illite/smectite with 95% illite layers.
END_XRD_ANALYSIS.
COMPOSITIONAL_ANALYSIS_TYPE: EM(WDS) # XRF, EM(WDS), ICP(Trace), WChem
| COMPOSITION: | SiO2 | 52.10 | wt% | SiO2 |
| COMPOSITION: | TiO2 | 0.79 | wt% | TiO2 |
| COMPOSITION: | Al2O3 | 21.90 | wt% | Al2O3 |
| COMPOSITION: | Fe2O3 | 6.44 | wt% | Fe2O3 |
| COMPOSITION: | MnO | <0.02 | wt% | MnO |
| COMPOSITION: | MgO | 2.39 | wt% | MgO |
| COMPOSITION: | CaO | 1.07 | wt% | CaO |
| COMPOSITION: | Na2O | 0.30 | wt% | Na2O |
| COMPOSITION: | K2O | 7.84 | wt% | K2O |
| COMPOSITION: | P2O5 | 0.10 | wt% | P2O5 |
| COMPOSITION: | LOI | 6.91 | wt% | LOI |
| COMPOSITION: | Total | 99.56 | wt% | |
| COMPOSITION: | O=Cl,F,S | wt% | #correction for Cl, F, S | |
| COMPOSITION: | New Total | wt% |
COMPOSITION_TRACE:
COMPOSITION_DISCUSSION:
EM analysis by Gregg A. Swayze, Branch of Geophysics, USGS, Denver.
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 2362 0.2-3.0µm 200 g.s.= LIB_SPECTRA: splib04a r 2373 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.=