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