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(For further information on spectroscopy, see:
http://speclab.cr.usgs.gov)
TITLE: Perthite HS415 DESCRIPT
DOCUMENTATION_FORMAT: MINERAL
SAMPLE_ID: HS415
MINERAL_TYPE: Tectosilicate
MINERAL: Microcline with exsolved albite (Feldspar group)
FORMULA: KAlSi3O8 + NaAlSi3O8
FORMULA_HTML: KAlSi3O8 + NaAlSi3O8
COLLECTION_LOCALITY: Perth, Ontario
ORIGINAL_DONOR: Hunt and Salisbury Collection
CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
SAMPLE_DESCRIPTION:
"T-13 Perthite 415B--Perth, Ontario. perthite is a name given to intergrown orthoclase or microcline with albite. The spectrum indicates a small amount of water, plus the fall off at 0.55µ similar to the feature discussed for microcline's 151B and 108B, and for orthoclase 82B."
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.
A weak 2.2-µm feature is present, indicating some alteration. Otherwise the spectrum rates an a.
IMAGE_OF_SAMPLE:
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
Albite + microcline(L)
END_XRD_ANALYSIS.
COMPOSITIONAL_ANALYSIS_TYPE: None # XRF, EM(WDS), ICP(Trace), WChem
COMPOSITION_TRACE:
COMPOSITION_DISCUSSION:
END_COMPOSITION_DISCUSSION.
MICROSCOPIC_EXAMINATION:
END_MICROSCOPIC_EXAMINATION.
SPECTROSCOPIC_DISCUSSION:
END_SPECTROSCOPIC_DISCUSSION.
SPECTRAL_PURITY: 1c2b3b4_ # 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 3851 | 0.2-3.0µm | 200 | g.s.= |
| LIB_SPECTRA: | splib05a r 5375 | 0.2-3.0µm | 200 | g.s.= |
| LIB_SPECTRA: | splib06a r 17557 | g.s.= | ||
| LIB_SPECTRA: | splib06a r 17569 | g.s.= |