TITLE: Sanidine NMNH103200 Feldspar DESCRIPT

DOCUMENTATION_FORMAT: MINERAL

SAMPLE_ID: NMNH103200

MINERAL_TYPE: Tectosilicate

MINERAL: Sanidine (Feldspar group)

FORMULA: (K,Na)AlSi3O8

FORMULA_HTML: (K,Na)AlSi3O8

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: EM(WDS) # XRF, EM(WDS), ICP(Trace), WChem

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%

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:

END_SPECTROSCOPIC_DISCUSSION.

SPECTRAL_PURITY: 1_2_3_4_

LIB_SPECTRA_HED: where Wave Range Av_Rs_Pwr Comment

LIB_SPECTRA: splib04a r 4328 0.2-3.0µm 200 g.s.=

LIB_SPECTRA: splib05a r ____ 0.2-3.0µm 200 g.s.=

LIB_SPECTRA: splib06a r ____ 1.5-25µm 250 g.s.=