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 <60µm (d), 60-104µm (c), 104-150µm (b), and 150-250µm (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.
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
None
END_XRD_ANALYSIS.
COMPOSITIONAL_ANALYSIS_TYPE: EM(WDS) # XRF, EM(WDS), ICP(Trace), WChem
| 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 is a pure mineral separate. Some spectra show weak 2.3 µm alteration features. The rest of the spectrum rates an a on the spectral purity scale.
END_MICROSCOPIC_EXAMINATION.
SPECTROSCOPIC_DISCUSSION:
END_SPECTROSCOPIC_DISCUSSION.
SPECTRAL_PURITY: 1_2_3_4_
LIB_SPECTRA_HED: where Wave Range Av_Rs_Pwr Comment
LIB_SPECTRA: splib04a r 3581 0.2-3.0µm 200 g.s.=165µm
LIB_SPECTRA: splib04a r 3592 0.2-3.0µm 200 g.s.=115µm
LIB_SPECTRA: splib04a r 3603 0.2-3.0µm 200 g.s.=70µm
LIB_SPECTRA: splib04a r 3614 0.2-3.0µm 200 g.s.=25µm
LIB_SPECTRA: splib05a r ____ 0.2-3.0µm 200 g.s.=
LIB_SPECTRA: splib06a r ____ 1.5-25µm 250 g.s.=