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Clark et. al. 2003 USGS Open File Report 03-395
Spectral Library splib05a Sample Description

(For further information on spectrsocopy, see: http://speclab.cr.usgs.gov)

TITLE: Sanidine GDS19 Feldspar DESCRIPT

DOCUMENTATION_FORMAT: MINERAL

SAMPLE_ID: GDS19

MINERAL_TYPE: Tectosilicate

MINERAL: Sanidine (Feldspar group)

FORMULA: (K,Na)AlSi3O8

FORMULA_HTML: (K,Na)AlSi3O8

COLLECTION_LOCALITY: Volkesfeld bei kempenick, Eifel, Rheinland, Germany

ORIGINAL_DONOR: Dave Stewart

CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

SAMPLE_DESCRIPTION:

"Results of petrographic examination: Hand sample is large (56.16g) fragment of what appears to be a badly fractured single crystal. Small fragments are transparent, but 'smoky'. Shows no significant contamination under the microscope."

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:

Pure sanidine. (Norma Vergo)

END_XRD_ANALYSIS.

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

COMPOSITION
KEYWORD
Oxide
ASCII
Amount Weight
Percent, %
Oxide
html
COMPOSITION: SiO2 64.53 wt% SiO2
COMPOSITION: TiO2 0.03 wt% TiO2
COMPOSITION: Al2O3 18.76 wt% Al2O3
COMPOSITION: FeO 0.17 wt% FeO
COMPOSITION: MnO 0.04 wt% MnO
COMPOSITION: MgO 0.04 wt% MgO
COMPOSITION: CaO 0.02 wt% CaO
COMPOSITION: Na2O 1.30 wt% Na2O
COMPOSITION: K2O 13.96 wt% K2O
COMPOSITION: Total 98.86 wt%

COMPOSITION_TRACE:

COMPOSITION_DISCUSSION:

Microprobe analysis showed sample to be homogeneous within and between grains, and to be of typical sanidine composition except for the unusually low albite content. Average of 10 samples.

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: 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 4317 0.2-3.0µm 200 g.s.=
LIB_SPECTRA: splib05a r 6051 0.2-3.0µm 200 g.s.=


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