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(For further information on spectrsocopy, see:
http://speclab.cr.usgs.gov)
TITLE: Adularia GDS57 Orthoclase DESCRIPT
DOCUMENTATION_FORMAT: MINERAL
SAMPLE_ID: GDS57
MINERAL_TYPE: Tectosilicate
MINERAL: Adularia (Orthoclase)(Feldspar group)
FORMULA: KAlSi3O8
FORMULA_HTML: KAlSi3O8
COLLECTION_LOCALITY: Floestenthal Tyrol, Austria
ORIGINAL_DONOR: Colorado School of Mines
CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
SAMPLE_DESCRIPTION:
K-feldspar commonly found in psuedo-orthorhombic crystals. It occurs mainly in low-temperature veins in gneisses and schists.
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
Feldspar of orthoclase subgroup.
Konnert, Judith and Marta Flohr, 1992, unpublished data, USGS Reston, VA.
END_XRD_ANALYSIS.
COMPOSITIONAL_ANALYSIS_TYPE: None # XRF, EM(WDS), ICP(Trace), WChem
COMPOSITION_TRACE: None
COMPOSITION_DISCUSSION:
None
END_COMPOSITION_DISCUSSION.
MICROSCOPIC_EXAMINATION:
Bimodal grain size distribution:
population 1 = 650µm 99 vol%
population 2 = 40µm 1 vol%
avg. grain size of populations = 648µm
Smaller grains cover 20% of larger tabular grains. Grains have low relief, first order gray interference color, no visible twins, refractive index close to 1.51 oil. This sample was ground from a single k-feldspar crystal. G. Swayze
END_MICROSCOPIC_EXAMINATION.
SPECTROSCOPIC_DISCUSSION:
END_SPECTROSCOPIC_DISCUSSION.
SPECTRAL_PURITY: 1a2_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 84 | 0.2-3.0µm | 200 | g.s.= 648 µm |
| LIB_SPECTRA: | splib05a r 131 | 0.2-3.0µm | 200 | g.s.= |
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