DOCUMENTATION_FORMAT: MINERAL
SAMPLE_ID: SMR-15.a, SMR-15.b, SMR-15.c, SMR-15.d
MINERAL_TYPE: Phyllosilicate
MINERAL: Thuringite (Chlorite Group)
FORMULA: (Mg,Fe)3(Si,Al)4O10(OH)2-(Mg,Fe)3(OH)6
FORMULA_HTML: (Mg,Fe)3(Si,Al)4O10(OH)2-(Mg,Fe)3(OH)6
COLLECTION_LOCALITY: Not available
ORIGINAL_DONOR: Gene Whitney, U.S.G.S
CURRENT_SAMPLE_LOCATION: U.S.G.S. Denver Spectroscopy Laboratory.
ULTIMATE_SAMPLE_LOCATION: U.S.G.S. Denver Spectroscopy Laboratory.
SAMPLE_DESCRIPTION:
Sample was ground in an alumina mortar and pestle and wet sieved with methanol into grain size fractions.
King, T.V.V. and R.N. Clark, 1989, Spectral Characteristics of Chlorites and Mg-Serpentines Using high-Resolution Reflectance Spectroscopy. Jour. Geophys. Res., 13.997-14,008.
Grain size fractions are indicated by the extension after the sample number:
.d = less than 30µm
.c = 30-45µm
.b = 60-104µm
.a = 104-150µm
IMAGE_OF_SAMPLE:
NO PHOTO
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
Sample is representative of its structural classification. (King and Clark, 1989). END_XRD_ANALYSIS.
COMPOSITIONAL_ANALYSIS_TYPE: EPMA # XRF, EPMA, ICP(Trace), WChem
COMPOSITION KEYWORD |
Oxide ASCII |
Amount | Weight Percent, % |
Oxide html |
---|---|---|---|---|
COMPOSITION: | SiO2 | 24.70 | wt% | SiO2 |
COMPOSITION: | TiO2 | 0.69 | wt% | TiO2 |
COMPOSITION: | Al2O3 | 21.10 | wt% | Al2O3 |
COMPOSITION: | Fe2O3 | 37.50 | wt% | Fe2O3 |
COMPOSITION: | MnO | 0.72 | wt% | MnO |
COMPOSITION: | MgO | 16.80 | wt% | MgO |
COMPOSITION: | CaO | 0.40 | wt% | CaO |
COMPOSITION: | Na2O | 0.32 | wt% | Na2O |
COMPOSITION: | K2O | 0.03 | wt% | K2O |
COMPOSITION: | P2O5 | 0.30 | wt% | P2O5 |
COMPOSITION: | LOI | 7.50 | wt% | LOI |
COMPOSITION: | Total | 101.00 | wt% |
COMPOSITION_TRACE:
COMPOSITION_DISCUSSION:
Compositional data provided by Gene Whitney, USGS, Denver, CO
King, T.V.V. and R.N. Clark, 1989, Spectral Characteristics of
Chlorites and Mg-Serpentines Using high-Resolution Reflectance
Spectroscopy. Jour. Geophys. Res., 13.997-14,008.
END_COMPOSITION_DISCUSSION.
MICROSCOPIC_EXAMINATION:
Microscopically this appears to be pure thuringite. All size fractions were examined visually and by energy dispersive methods to ensure chemical homogeneity as a function of grain size interval.
END_MICROSCOPIC_EXAMINATION.
SPECTROSCOPIC_DISCUSSION:
END_SPECTROSCOPIC_DISCUSSION.
SPECTRAL_PURITY: 1b2b3c4_ # SMR-15.a # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns
SPECTRAL_PURITY: 1a2a3a4_ # SMR-15.b # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns
SPECTRAL_PURITY: 1_2a3a4_ # SMR-15.c # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns
SPECTRAL_PURITY: 1a2a3a4_ # SMR-15.d # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns