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Clark et. al. 2003 USGS Open File Report 03-395
Spectral Library splib05a Sample Description

(For further information on spectrsocopy, 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 (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:

Not Available

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 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: 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 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.=


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