DOCUMENTATION_FORMAT: MINERAL
SAMPLE_ID: SMR-15
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: unknown
ORIGINAL_DONOR: Gene Whitney, USGS, Denver
CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
SAMPLE_DESCRIPTION:
Sample was ground in an alumina mortar and pestle and wet sieved with methanol into <30µm, 30-45µm, 60-104µm, and 104-150µm 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.
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
Sample is representative of its structural classification. (King and Clark, 1989). END_XRD_ANALYSIS.
COMPOSITIONAL_ANALYSIS_TYPE: EM(WDS) # XRF, EM(WDS), ICP(Trace), WChem
| 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 homogenity as a function of grain size interval.
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 4760 0.2-2.7µm 200 g.s.=115µm
LIB_SPECTRA: splib04a r 4771 0.2-2.7µm 200 g.s.=80µm
LIB_SPECTRA: splib04a r 4782 0.2-2.7µm 200 g.s.=32µm
LIB_SPECTRA: splib04a r 4793 0.2-2.7µm 200 g.s.=15µm
LIB_SPECTRA: splib05a r ____ 0.2-3.0µm 200 g.s.=
LIB_SPECTRA: splib06a r ____ 1.5-25µm 250 g.s.=