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(For further information on spectroscopy, see:
http://speclab.cr.usgs.gov)
TITLE: Olivine GDS70.a GSB 165um DESCRIPT
DOCUMENTATION_FORMAT: MINERAL
SAMPLE_ID: GDS70
MINERAL_TYPE: Nesosilicate
MINERAL: Olivine (Olivine group)
FORMULA: Mg2SiO4-Fe2SiO4 Fo89
FORMULA_HTML: Mg2Si4-Fe2SiO4 Fo89
COLLECTION_LOCALITY: South Point, Hawaii, Hawaii
ORIGINAL_DONOR: Roger N. Clark
CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
SAMPLE_DESCRIPTION:
This sample is commonly referred to as the "green sand beach"
olivine. The sample was sieved into;
less than 60µm (d),
60-104µm with a median grain size of 70µm (c),
104-150µm with a median grain size of 115µm (b),
and 150-250µm with a median grain size of 165µm (a) size fractions.
All samples were examined using a petrographic microscope and hand-picked prior to
wet-sieving.
King, T.V.V. and W.I. Ridley, 1987, Relation of the Spectroscopic Reflectance of Olivine to Mineral Chemistry and Some Remote Sensing Implications. J. Geophys. Res., 11,457-11,469.
IMAGE_OF_SAMPLE:
NO PHOTO
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
Forsterite plus possible trace corundum. (Steve Sutley)
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 | 41.09 | wt% | SiO2 |
| COMPOSITION: | TiO2 | 0.01 | wt% | TiO2 |
| COMPOSITION: | Cr2O3 | 0.05 | wt% | Cr2O3 |
| COMPOSITION: | FeO | 9.16 | wt% | FeO |
| COMPOSITION: | NiO | 0.39 | wt% | NiO |
| COMPOSITION: | MnO | 0.21 | wt% | MnO |
| COMPOSITION: | MgO | 49.29 | wt% | MgO |
| COMPOSITION: | CaO | 0.03 | wt% | CaO |
| COMPOSITION: | Total | 100.23 | wt% | |
| COMPOSITION: | O=Cl,F,S | wt% | #correction for Cl, F, S | |
| COMPOSITION: | New Total | wt% |
COMPOSITION_TRACE:
COMPOSITION_DISCUSSION:
Microprobe analysis by W.I. Ridley at the USGS microprobe facility in Denver, Colorado.
END_COMPOSITION_DISCUSSION.
MICROSCOPIC_EXAMINATION:
This appears to be a pure mineral separate through the microscope. Some spectra show weak 2.3 µm alteration features. The rest of the spectrum rates an "a" on the spectral purity scale. Because of the trace alteration, however, the spectra rate a "b" overall.
END_MICROSCOPIC_EXAMINATION.
SPECTROSCOPIC_DISCUSSION:
END_SPECTROSCOPIC_DISCUSSION.
SPECTRAL_PURITY: 1b2b3b4b # 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 3581 | 0.2-3.0µm | 200 | g.s.= 165 µm |
| LIB_SPECTRA: | splib04a r 3592 | 0.2-3.0µm | 200 | g.s.= 115 µm |
| LIB_SPECTRA: | splib04a r 3603 | 0.2-3.0µm | 200 | g.s.= 70 µm |
| LIB_SPECTRA: | splib04a r 3614 | 0.2-3.0µm | 200 | g.s.= 25 µm |
| LIB_SPECTRA: | splib05a r 5038 | 0.2-3.0µm | 200 | g.s.= |
| LIB_SPECTRA: | splib05a r 5051 | 0.2-3.0µm | 200 | g.s.= |
| LIB_SPECTRA: | splib05a r 5064 | 0.2-3.0µm | 200 | g.s.= |
| LIB_SPECTRA: | splib05a r 5077 | 0.2-3.0µm | 200 | g.s.= |
| LIB_SPECTRA: | splib06a r 16284 | g.s.= | ||
| LIB_SPECTRA: | splib06a r 16298 | g.s.= | ||
| LIB_SPECTRA: | splib06a r 16343 | g.s.= | ||
| LIB_SPECTRA: | splib06a r 16357 | g.s.= | ||
| LIB_SPECTRA: | splib06a r 16402 | g.s.= | ||
| LIB_SPECTRA: | splib06a r 16416 | g.s.= | ||
| LIB_SPECTRA: | splib06a r 16461 | g.s.= | ||
| LIB_SPECTRA: | splib06a r 16475 | g.s.= |