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(For further information on spectrsocopy, see:
http://speclab.cr.usgs.gov)
TITLE: Orthoclase HS13 DESCRIPT
DOCUMENTATION_FORMAT: MINERAL
SAMPLE_ID: HS13
MINERAL_TYPE: Tectosilicate
MINERAL: Orthoclase (Feldspar group)
FORMULA: KAlSi3O8
FORMULA_HTML: KAlSi3O8
COLLECTION_LOCALITY: Ruggles Mine, New Hampshire
ORIGINAL_DONOR: Hunt and Salisbury Collection
CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
SAMPLE_DESCRIPTION:
Forms series with Celsian. Dimorphous with Microcline.
"S-15. Orthoclase. Ruggles Mine, New Hampshire (13B). Orthoclase, KAlSi3O8, is a very common igneous rock-forming mineral, particularly in acidic and intermediate rock. Usually it contains 10 to 25% NaAlSi3O8. Orthoclase should be spectrally featureless in the near-infrared. The bands near 1.4 and 2.0µ are due to water present in microscopic fluid inclusions within the mineral grains."
Sieve interval 74 - 250µm.
Hunt, G.R., J.W. Salisbury, 1970, Visible and near-infrared spectra of minerals and rocks: I. Silicate minerals. Modern Geology, v. 1, p. 283-300.
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
Na-feldspar(L) + K-feldspar(L) + mica(m)
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:
Sample has relatively strong mica bands in the 2 - 2.5 micron region.
END_SPECTROSCOPIC_DISCUSSION.
SPECTRAL_PURITY: 1c2_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 3786 | 0.2-3.0µm | 200 | g.s.= |
| LIB_SPECTRA: | splib05a r 5279 | 0.2-3.0µm | 200 | g.s.= |
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