Sample Description USGS Spectral Library Version 7

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: Forsterite AZ-01 ASU DESCRIPT

DOCUMENTATION_FORMAT: MINERAL

SAMPLE_ID: AZ-01

MINERAL_TYPE: Nesosilicate

MINERAL: Forsterite (Mg-endmember Olivine group)

FORMULA: Mg2SiO4

FORMULA_HTML: Mg₂Si₄

COLLECTION_LOCALITY: San Carlos, Arizona, USA

ORIGINAL_DONOR: Arizona State University Spectral Library (purchased from Rocks & Gems of the Ages)

CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

SAMPLE_DESCRIPTION:

Sample is from the Arizona State University Spectral Library collection (Christensen et al., 2000) and was processed in their laboratory to a fine pale green powder.

Christensen, P.R., Bandfield, J.L, Hamilton, V.E., Howard, D.A., Lane, M.D., Piatek, J.L., Ruff, S.W., and Stefanov, W.L., 2000, A thermal emission spectral library of rock-forming minerals: Journal of Geophysical Research, v. 105, p. 9735-9739.

IMAGE_OF_SAMPLE:
NO PHOTO

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

Pure forsterite (R. Driscoll)

END_XRD_ANALYSIS.

COMPOSITIONAL_ANALYSIS_TYPE: EPMA # XRF, EPMA, ICP(Trace), WChem

COMPOSITION_TRACE:

COMPOSITION_DISCUSSION:

Microprobe and bulk compositional analysis listed on ASU Spectral Library website.

END_COMPOSITION_DISCUSSION.

MICROSCOPIC_EXAMINATION:

END_MICROSCOPIC_EXAMINATION.

SPECTROSCOPIC_DISCUSSION: The visible-near infrared spectrum is dominated by a broad complex of overlapping electronic absorptions centered at 1.058 microns with shoulders at 0.814 and 1.317 microns. (G. Swayze)

END_SPECTROSCOPIC_DISCUSSION.

SPECTRAL_PURITY: 1a2_3_4_ # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns