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(For further information on spectroscopy, see:
http://speclab.cr.usgs.gov)
TITLE: Microcline HS107 Feldspar DESCRIPT
DOCUMENTATION_FORMAT: MINERAL
SAMPLE_ID: HS107
MINERAL_TYPE: Tectosilicate
MINERAL: Microcline (Feldspar group)
FORMULA: KAlSi3O8
FORMULA_HTML: KAlSi3O8
COLLECTION_LOCALITY: Keystone, South Dakota
ORIGINAL_DONOR: Hunt and Salisbury Collection
CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
SAMPLE_DESCRIPTION:
Dimorphous with Orthoclase.
"The spectrum (107B) displays a very intense OH band near 1.4µ with an accompanying feature near 2.2µ. The very weak band near 1.9µ indicates only a very small amount of H2O. The bands are consistent with the incipient alteration of this sample to kaolinite."
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.
Note, however, that the 2.2-2.4 µm bands are those of muscovite (or similar mica), not kaolinite as noted by Hunt and others That is confirmed by XRD below. - R. Clark
IMAGE_OF_SAMPLE:
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
Max. microcline + albite(L) + muscovite(m)
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: 1d2d3c4_ # 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 3001 | 0.2-3.0µm | 200 | g.s.= |
| LIB_SPECTRA: | splib05a r 4366 | 0.2-3.0µm | 200 | g.s.= |
| LIB_SPECTRA: | splib06a r 13694 | g.s.= | ||
| LIB_SPECTRA: | splib06a r 13706 | g.s.= |