DOCUMENTATION_FORMAT: MIXTURE
SAMPLE_ID: NMNH103200
MIXTURE_TYPE: Intimate
MIXTURE: Sanidine and albite (Feldspar group)
FORMULA: (K,Na)AlSi3O8 and NaAlSi3O8
FORMULA_HTML: (K,Na)AlSi3O8 and NaAlSi3O8
COLLECTION_LOCALITY: Higasinuiro-gun, Taiji, Wakayama, Japan
ORIGINAL_DONOR: Smithsonian Institution
CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
SAMPLE_DESCRIPTION:
"Result of petrographic examination: Many small (0.5cm) euhedral
crystals totaling 6.49 g. almost all have some adhering clay/limonite,
to be removed by brushing or ultrasonic cleaning. Under the microscope,
a very, very few acicular inclusions (rutile?) can be seen. Otherwise,
very pure."
Salisbury, J. W., Walter, L. W., and Vergo, N., 1987, Mid-Infrared
(2.1-25µm) Spectra of Minerals: First Edition, U.S. Geological
Survey Open File Report 87-263.
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
Sanidine plus a moderate amount of albite.
Salisbury, J. W., Walter, L. W., and Vergo, N., 1987, Mid-Infrared
(2.1-25µm) Spectra of Minerals: First Edition, U.S. Geological
Survey Open File Report 87-263.
END_XRD_ANALYSIS.
COMPOSITIONAL_ANALYSIS_TYPE: EPMA # XRF, EPMA, ICP(Trace), WChem
COMPOSITION_TRACE:
COMPOSITION_DISCUSSION:
"Microprobe analysis shows homogeneity within and between grains. This
is typical sanidine with about as much soda as potash, but the albite
present is cryptoperthic. Average of 10 analyses."
Salisbury, J. W., Walter, L. W., and Vergo, N., 1987, Mid-Infrared
(2.1-25µm) Spectra of Minerals: First Edition, U.S. Geological
Survey Open File Report 87-263.
END_COMPOSITION_DISCUSSION.
MICROSCOPIC_EXAMINATION:
END_MICROSCOPIC_EXAMINATION.
SPECTROSCOPIC_DISCUSSION:
A sharp weak absorption at 0.38 microns and broader weak absorption at 0.97 microns indicate the presence of trace levels of contaminants in this sample. G. Swayze.
END_SPECTROSCOPIC_DISCUSSION.
SPECTRAL_PURITY: 1c2b3b4_ # SAMPLE_ID: NMNH103200 # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns
COMPOSITION
KEYWORDOxide
ASCIIAmount
Weight
Percent, %Oxide
html
COMPOSITION: SiO2 67.43 wt% SiO2
COMPOSITION: TiO2 0.03 wt% TiO2
COMPOSITION: Al2O3 18.65 wt% Al2O3
COMPOSITION: FeO 0.59 wt% FeO
COMPOSITION: MnO 0.02 wt% MnO
COMPOSITION: MgO 0.03 wt% MgO
COMPOSITION: CaO 0.02 wt% CaO
COMPOSITION: Na2O 5.38 wt% Na2O
COMPOSITION: K2O 7.38 wt% K2O
COMPOSITION: Total 99.97 wt%