DOCUMENTATION_FORMAT: MINERAL
SAMPLE_ID: GDS113, GDS113a
MINERAL_TYPE: Phyllosilicate
MINERAL: Muscovite (Mica group)
FORMULA: KAl2Si3O10(OH)2
FORMULA_HTML: KAl2Si3O10(OH)2
COLLECTION_LOCALITY: Brazil
ORIGINAL_DONOR: C.V. Clemency, SUNY
CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
SAMPLE_DESCRIPTION:
Sample is composed of white particles.
GDS113 particle size is greater than 37 microns (grain size and the acronynm XRD are marked on the bottle).
GDS113a particle size is not specified.
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) small
sample size required smear mounts, which are responsible for
a strong preferred basal orientation in each of the patterns."
J.S. Huebner, J. Pickrell, and J. Randow, 1993, written communication.
END_XRD_ANALYSIS.
COMPOSITIONAL_ANALYSIS_TYPE: XRF # XRF, EPMA, ICP(Trace), WChem
COMPOSITION KEYWORD |
Oxide ASCII |
Amount | Weight Percent, % |
Oxide html |
---|---|---|---|---|
COMPOSITION: | SiO2 | 45.89 | wt% | SiO2 |
COMPOSITION: | TiO2 | 0.32 | wt% | TiO2 |
COMPOSITION: | Al2O3 | 35.64 | wt% | Al2O3 |
COMPOSITION: | Fe2O3 | 1.08 | wt% | Fe2O3 |
COMPOSITION: | FeO | 0.81 | wt% | FeO |
COMPOSITION: | MnO | 0.02 | wt% | MnO |
COMPOSITION: | MgO | 0.56 | wt% | MgO |
COMPOSITION: | Na2O | 0.78 | wt% | Na2O |
COMPOSITION: | K2O | 10.00 | wt% | K2O |
COMPOSITION: | F | 0.23 | wt% | F |
COMPOSITION: | H2O+ | 4.84 | wt% | H2O+ |
COMPOSITION: | Total | 100.17 | wt% | |
COMPOSITION: | O=Cl,F,S | 0.10 | wt% | #correction for Cl, F, S |
COMPOSITION: | New Total | 100.07 | wt% |
Lin, F.C. and C.V. Clemency, 1981, Geochimica et Cosmochimica Acta 45, no. 4.
COMPOSITION_TRACE:
COMPOSITION_DISCUSSION:
END_COMPOSITION_DISCUSSION.
MICROSCOPIC_EXAMINATION:
END_MICROSCOPIC_EXAMINATION.
SPECTROSCOPIC_DISCUSSION:
END_SPECTROSCOPIC_DISCUSSION.
SPECTRAL_PURITY: 1a2a3a4a # GDS113 # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns
SPECTRAL_PURITY: 1a2_3_4_ # GDS113a # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns