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(For further information on spectroscopy, see:
http://speclab.cr.usgs.gov)
TITLE: Olivine NMNH137044 Fo92 DESCRIPT
DOCUMENTATION_FORMAT: MINERAL
SAMPLE_ID: NMNH137044
MINERAL_TYPE: Nesosilicate
MINERAL: Olivine (Fosterite-Fayalite series, Olivine group)
FORMULA: (Mg,Fe)2SiO4 Fo92
FORMULA_HTML: (Mg,Fe)2SiO4 Fo92
COLLECTION_LOCALITY: Chavira Mine, Kamargo (nr), Chihuahua, Mexico
ORIGINAL_DONOR: Smithsonian
CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
SAMPLE_DESCRIPTION:
The sample consists of many 0.5cm particles plus one large fragment. Under petrographic microscope, the hand-picked sample appears clean but one of the grains may be pyroxene.
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.
Sample is in two sieve intervals: (a) 74-250µm and (b) less than 74µm.
IMAGE_OF_SAMPLE:
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
Pure forsterite.
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: EM(WDS) # XRF, EM(WDS), ICP(Trace), WChem
| COMPOSITION KEYWORD |
Oxide ASCII |
Amount | Weight Percent, % |
Oxide html |
|---|---|---|---|---|
| COMPOSITION: | SiO2 | 40.27 | wt% | SiO2 |
| COMPOSITION: | TiO2 | 0.01 | wt% | TiO2 |
| COMPOSITION: | Al2O3 | 0.02 | wt% | Al2O3 |
| COMPOSITION: | FeO | 8.70 | wt% | FeO |
| COMPOSITION: | MnO | 0.15 | wt% | MnO |
| COMPOSITION: | MgO | 52.28 | wt% | MgO |
| COMPOSITION: | CaO | 0.06 | wt% | CaO |
| COMPOSITION: | Na2O | 0.02 | wt% | Na2O |
| COMPOSITION: | K2O | 0.01 | wt% | K2O |
| COMPOSITION: | Total | 101.52 | wt% |
COMPOSITION_TRACE:
COMPOSITION_DISCUSSION:
Microprobe analysis of hand-picked grains showed the sample to be homogeneous within and between grains. Average of 10 analyses showed the sum of the divalent cations too high, but Fo content is approximately 92 mole percent.
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 3559 | 0.2-3.0µm | 200 | g.s.= |
| LIB_SPECTRA: | splib04a r 3570 | 0.2-3.0µm | 200 | g.s.= |
| LIB_SPECTRA: | splib05a r 5231 | 0.2-3.0µm | 200 | g.s.= |
| LIB_SPECTRA: | splib05a r 5244 | 0.2-3.0µm | 200 | g.s.= |
| LIB_SPECTRA: | splib06a r 17191 | g.s.= | ||
| LIB_SPECTRA: | splib06a r 17204 | g.s.= |