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Konnert, Judith and Marta Flohr, 1992, unpublished data, USGS Reston, VA.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_DISCUSSION:
None
END_COMPOSITION_DISCUSSION.
MICROSCOPIC_EXAMINATION:
Bimodal grain size distribution:
population 1 = 650µm 99 vol%
population 2 = 40µm 1 vol%
av gr sz 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: 1_2_3_4_
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 ____ 0.2-3.0µm 200 g.s.=
LIB_SPECTRA: splib06a r ____ 1.5-25µm 250 g.s.=