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(For further information on spectroscopy, see:
http://speclab.cr.usgs.gov)
TITLE: Riebeckite NMHN122689 Amphibole DESCRIPT
DOCUMENTATION_FORMAT: MINERAL
SAMPLE_ID: NMHN122689
MINERAL_TYPE: Inosilicate
MINERAL: Riebeckite (Amphibole group)
FORMULA: Na2Fe(+2)3Fe(+3)2Si8O22(OH)2
FORMULA_HTML: Na2Fe3+2Fe2+3Si8O22(OH)2
COLLECTION_LOCALITY: Hurricane Mountain, Conway, New Hampshire
ORIGINAL_DONOR: National Museum of Natural History
CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
SAMPLE_DESCRIPTION:
Individual grains of riebeckite appear very pure under the microscope (less than 1% 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.
IMAGE_OF_SAMPLE:
NO PHOTO
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
Pure reibeckite.
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_XRD_ANALYSIS.
COMPOSITIONAL_ANALYSIS_TYPE: None # XRF, EM(WDS), ICP(Trace), WChem
| COMPOSITION KEYWORD |
Oxide ASCII |
Amount | Weight Percent, % |
Oxide html |
|---|---|---|---|---|
| COMPOSITION: | SiO2 | 50.32 | wt% | SiO2 |
| COMPOSITION: | TiO2 | 0.53 | wt% | TiO2 |
| COMPOSITION: | Al2O3 | 0.86 | wt% | Al2O3 |
| COMPOSITION: | FeO | 35.27 | wt% | FeO |
| COMPOSITION: | MnO | 1.12 | wt% | MnO |
| COMPOSITION: | MgO | 0.07 | wt% | MgO |
| COMPOSITION: | CaO | 0.08 | wt% | CaO |
| COMPOSITION: | Na2O | 7.95 | wt% | Na2O |
| COMPOSITION: | K2O | 1.41 | wt% | K2O |
| COMPOSITION: | Total | 97.61 | wt% |
COMPOSITION_TRACE: None
COMPOSITION_DISCUSSION:
Microprobe analysis of hand-picked sample shows it to be homogeneous within and between grains, with typical riebeckite composition. 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 4241 | 0.2-3.0µm | 200 | g.s.= |
| LIB_SPECTRA: | splib05a r 5978 | 0.2-3.0µm | 200 | g.s.= |
| LIB_SPECTRA: | splib06a r 19614 | g.s.= |