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USGS Spectral Library Version 7 Sample Description

Kokaly, R.F., Clark, R.N., Swayze, G.A., Livo, K.E., Hoefen, T.M., Pearson, N.C., Wise, R.A., Benzel, W.M., Lowers, H.A., Driscoll, R.L., and Klein, A.J., 2017, USGS Spectral Library Version 7: U.S. Geological Survey Data Series 1035, 61 p., https://doi.org/10.3133/ds1035
For more information on the library, see: local link web link

TITLE: basalt_fresh BR93-46B DESCRIPT

DOCUMENTATION_FORMAT: MIXTURE

SAMPLE_ID: BR93-46B

MIXTURE_TYPE: Intimate

MIXTURE: Anorthite, Augite, Quartz, Tridymite, and Cristobalite

FORMULA: CaAl2Si2O8, (Ca,Na)(Mg,Fe,Al,Ti)(Si,Al)2O6, SiO2, SiO2, and SiO2

FORMULA_HTML: CaAl2Si2O8, (Ca,Na)(Mg,Fe,Al,Ti)(Si,Al)2O6, SiO2, SiO2, and SiO2

COLLECTION_LOCALITY: Newberry Mtns, Southeast of Barstow, CA, USA

COLLECTION_LATITUDE: Not Available # degrees and decimal minutes (N or S)

COLLECTION_LONGITUDE: Not Available # degrees and decimal minutes (W or E)

DATUM: Not Available # coordinate datum

ORIGINAL_DONOR: Eric Livo

CURRENT_SAMPLE_LOCATION: U.S.G.S. Denver Spectroscopy Laboratory

ULTIMATE_SAMPLE_LOCATION: U.S.G.S. Denver Spectroscopy Laboratory

SAMPLE_DESCRIPTION:

Basalt - gray vesicular flow rock (Fresh interior surface).
Mixture of Anorthite (Tectosilicate-Plagioclase,Ca endmember,Feldspar group), Augite (Inosilicate-Pyroxene group), Quartz (Tectosilicate), Tridymite (high-temperature polymorph of quartz), and Cristobalite (high-temperature polymorph of quartz)

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

Major: Anorthite
Minor: Augite, Quartz, Tridymite, and Cristobalite

END_XRD_ANALYSIS.

COMPOSITIONAL_ANALYSIS_TYPE: None # XRF, EPMA, ICP(Trace), WChem

COMPOSITION_TRACE: None

COMPOSITION_DISCUSSION:

No additional compositional details available.

END_COMPOSITION_DISCUSSION.

MICROSCOPIC_EXAMINATION:

END_MICROSCOPIC_EXAMINATION.

IMAGE_OF_SAMPLE: Not Available

SPECTROSCOPIC_DISCUSSION:

Strong Fe+2 (Augite) absorption feature at one micron, Anorthite and the SiO2 don't contain absorption features in these wavelengths, though they may influence total reflectance levels. Spectral intensity is very low.

END_SPECTROSCOPIC_DISCUSSION.

SPECTRAL_PURITY: 1b2_3_4_ # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns