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(For further information on spectrsocopy, see:
http://speclab.cr.usgs.gov)
TITLE: Muscovite GDS119 Alamo DESCRIPT
DOCUMENTATION_FORMAT: MINERAL
SAMPLE_ID: GDS119
MINERAL_TYPE: Phyllosilicate
MINERAL: Muscovite (Mica group)
FORMULA: KAl2Si3O10(OH)2
FORMULA_HTML: KAl2Si3O10(OH)2
COLLECTION_LOCALITY: Mt. Alamo Mine, Ventura Co. CA
ORIGINAL_DONOR: Jim Post
CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
SAMPLE_DESCRIPTION:
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
40 kV - 30 mA, 6.5-9.5 keV
References: Bailey (1984, p. 574), Huebner's reference patterns
Found: dioctahedral mica, 2M1 polytype
Sought but not found: quartz, (100) would be distinct if present
Comments: Very similar patterns. Only mica detected. The mica (004)
reflection is at 17.6-17.9 degrees 2 theta indicating a large alkali
such as potassium (the dioctahedral Na-mica, paragonite,
has the (004) reflection at 18.4 degrees). The small sample size
required smear mounts, which are responsible for a strong
preferred basal orientation in each of the patterns. I'd be
surprised if you found any differences in the optical spectra
of these eight micas."
J.S. Huebner, J. Pickrell, and J. Randow, 1993, written communication.
END_XRD_ANALYSIS.
COMPOSITIONAL_ANALYSIS_TYPE: XRF # XRF, EM(WDS), ICP(Trace), WChem
| COMPOSITION KEYWORD |
Oxide ASCII |
Amount | Weight Percent, % |
Oxide html |
|---|---|---|---|---|
| COMPOSITION: | SiO2 | 46.28 | wt% | SiO2 |
| COMPOSITION: | TiO2 | 0.13 | wt% | TiO2 |
| COMPOSITION: | Al2O3 | 33.34 | wt% | Al2O3 |
| COMPOSITION: | Fe2O3 | 3.85 | wt% | Fe2O3 |
| COMPOSITION: | MnO | 0.04 | wt% | MnO |
| COMPOSITION: | MgO | 0.55 | wt% | MgO |
| COMPOSITION: | ZnO | 0.03 | wt% | ZnO |
| COMPOSITION: | BaO | 0.03 | wt% | BaO |
| COMPOSITION: | CaO | 0.10 | wt% | CaO |
| COMPOSITION: | Na2O | 0.64 | wt% | Na2O |
| COMPOSITION: | K2O | 9.97 | wt% | K2O |
| COMPOSITION: | H2O+ | 4.47 | wt% | H2O+ |
| COMPOSITION: | Total | 99.66 | wt% | |
| COMPOSITION: | O=Cl,F,S | wt% | #correction for Cl, F, S | |
| COMPOSITION: | New Total | wt% |
Jim Post, personal communication, 1991.
COMPOSITION_TRACE:
COMPOSITION_DISCUSSION:
END_COMPOSITION_DISCUSSION.
MICROSCOPIC_EXAMINATION:
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 3342 | 0.2-3.0µm | 200 | g.s.= |
| LIB_SPECTRA: | splib05a r 4780 | 0.2-3.0µm | 200 | g.s.= |
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