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(For further information on spectrsocopy, see:
http://speclab.cr.usgs.gov)
TITLE: Sanidine GDS19 Feldspar DESCRIPT
DOCUMENTATION_FORMAT: MINERAL
SAMPLE_ID: GDS19
MINERAL_TYPE: Tectosilicate
MINERAL: Sanidine (Feldspar group)
FORMULA: (K,Na)AlSi3O8
FORMULA_HTML: (K,Na)AlSi3O8
COLLECTION_LOCALITY: Volkesfeld bei kempenick, Eifel, Rheinland, Germany
ORIGINAL_DONOR: Dave Stewart
CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
SAMPLE_DESCRIPTION:
"Results of petrographic examination: Hand sample is large (56.16g) fragment of what appears to be a badly fractured single crystal. Small fragments are transparent, but 'smoky'. Shows no significant contamination under the microscope."
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:
Pure sanidine. (Norma Vergo)
END_XRD_ANALYSIS.
COMPOSITIONAL_ANALYSIS_TYPE: EM # XRF, EM(WDS), ICP(Trace), WChem
| COMPOSITION KEYWORD |
Oxide ASCII |
Amount | Weight Percent, % |
Oxide html |
|---|---|---|---|---|
| COMPOSITION: | SiO2 | 64.53 | wt% | SiO2 |
| COMPOSITION: | TiO2 | 0.03 | wt% | TiO2 |
| COMPOSITION: | Al2O3 | 18.76 | wt% | Al2O3 |
| COMPOSITION: | FeO | 0.17 | wt% | FeO |
| COMPOSITION: | MnO | 0.04 | wt% | MnO |
| COMPOSITION: | MgO | 0.04 | wt% | MgO |
| COMPOSITION: | CaO | 0.02 | wt% | CaO |
| COMPOSITION: | Na2O | 1.30 | wt% | Na2O |
| COMPOSITION: | K2O | 13.96 | wt% | K2O |
| COMPOSITION: | Total | 98.86 | wt% |
COMPOSITION_TRACE:
COMPOSITION_DISCUSSION:
Microprobe analysis showed sample to be homogeneous within and between grains, and to be of typical sanidine composition except for the unusually low albite content. Average of 10 samples.
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_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 4317 | 0.2-3.0µm | 200 | g.s.= |
| LIB_SPECTRA: | splib05a r 6051 | 0.2-3.0µm | 200 | g.s.= |
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