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(For further information on spectrsocopy, see:
http://speclab.cr.usgs.gov)
TITLE: Labradorite HS17 DESCRIPT
DOCUMENTATION_FORMAT: MINERAL
SAMPLE_ID: HS17
MINERAL_TYPE: Tectosilicate
MINERAL: Labradorite (Plagioclase)(Feldspar group)
FORMULA: (NaAlSi,CaAl2)Si2O8
FORMULA_HTML: (NaAlSi,CaAl2)Si2O8
COLLECTION_LOCALITY: Ontario
ORIGINAL_DONOR: Hunt and Salisbury Collection
CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
SAMPLE_DESCRIPTION:
"T-10 Labradorite 17B--Ontario. This plagioclase feldspar is composed of 30 to 50% albite. The spectrum of this sample is relatively flat and has a low reflectivity caused by the presence of magnetite as a microscopic disseminated impurity. We cannot account specifically for the maximum in reflectivity near 1.0µ in this spectrum. It is due to exceptionally broad, very weak absorptions on either side."
Sieve interval 74 - 250µm.
Hunt, G.R., J.W. Salisbury, and C.J. Lenhoff, 1973, Visible and near-infrared spectra of minerals and rocks: VI. Additional silicates. Modern Geology, v. 4, p. 85-106.
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
Labradorite + 6.25, 6.34 Angstroms (small amount) (Norma Vergo, USGS)
END_XRD_ANALYSIS.
COMPOSITIONAL_ANALYSIS_TYPE: None # XRF, EM(WDS), ICP(Trace), WChem
COMPOSITION_TRACE: None
COMPOSITION_DISCUSSION:
None
END_COMPOSITION_DISCUSSION.
MICROSCOPIC_EXAMINATION:
Not done yet
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 2696 | 0.2-3.0µm | 200 | g.s.= |
| LIB_SPECTRA: | splib05a r 4064 | 0.2-3.0µm | 200 | g.s.= |
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