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(For further information on spectrsocopy, see:
http://speclab.cr.usgs.gov)
TITLE: Richterite NMNH150800 Amphibole DESCRIPT
DOCUMENTATION_FORMAT: MINERAL
SAMPLE_ID: NMNH150800
MINERAL_TYPE: Inosilicate
MINERAL: Richterite (Amphibole group)
FORMULA: Na2Ca(Mg,Fe2+,Mn,Fe3+,Al)5(Si8O22)(OH,F)2
FORMULA_HTML: Na2Ca(Mg,Fe2+,Mn,Fe3+,Al)5(Si8O22)(OH,F)2
COLLECTION_LOCALITY: Wilberforce, Ontario, Canada
ORIGINAL_DONOR: National Museum of Natural History
CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
SAMPLE_DESCRIPTION:
"Results of petrographic examination: Two large (6.49 and 6.45 g) pieces and 2 fragments (4.18 b), black in color. Parts of single crystals. One fragment has large white (calcite) contamination. Crystals also have generally small blotchy inclusions of calcite. Crushed sample treated with HCl. Under the microscope, individual crystals before treatment appear clean and pure except for about 1% calcite impurities."
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:
Richterite plus a trace of mica. Infrared spectra do not show a mica hydroxyl band.
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.
Richterite plus a trace of mica (Norma Vergo).
END_XRD_ANALYSIS.
COMPOSITIONAL_ANALYSIS_TYPE: EM(WDS) # XRF, EM(WDS), ICP(Trace), WChem
| COMPOSITION KEYWORD |
Oxide ASCII |
Amount | Weight Percent, % |
Oxide html |
|---|---|---|---|---|
| COMPOSITION: | SiO2 | 54.87 | wt% | SiO2 |
| COMPOSITION: | TiO2 | 0.39 | wt% | TiO2 |
| COMPOSITION: | Al2O3 | 1.97 | wt% | Al2O3 |
| COMPOSITION: | FeO | 2.40 | wt% | FeO |
| COMPOSITION: | MnO | 0.20 | wt% | MnO |
| COMPOSITION: | MgO | 22.92 | wt% | MgO |
| COMPOSITION: | CaO | 9.09 | wt% | CaO |
| COMPOSITION: | Na2O | 4.32 | wt% | Na2O |
| COMPOSITION: | K2O | 1.48 | wt% | K2O |
| COMPOSITION: | Total | 97.65 | wt% |
COMPOSITION_TRACE: None
COMPOSITION_DISCUSSION:
Microprobe analysis by L. Walter shows sample to be homogeneous within and between grains, with a composition typical of richterite. Average of 9 analyses.
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: 1b2_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 4230 | 0.2-3.0µm | 200 | g.s.= |
| LIB_SPECTRA: | splib05a r 5952 | 0.2-3.0µm | 200 | g.s.= |
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