TITLE: Olivine GDS70 Fo89 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 <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.=