Sample Description USGS Spectral Library Version 7

USGS Spectral Library Version 7 Sample Description

Kokaly, R.F., Clark, R.N., Swayze, G.A., Livo, K.E., Hoefen, T.M., Pearson, N.C., Wise, R.A., Benzel, W.M., Lowers, H.A., Driscoll, R.L., and Klein, A.J., 2017, USGS Spectral Library Version 7: U.S. Geological Survey Data Series 1035, 61 p., https://doi.org/10.3133/ds1035
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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.

IMAGE_OF_SAMPLE:

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

Pure sanidine. (Norma Vergo)

END_XRD_ANALYSIS.

COMPOSITIONAL_ANALYSIS_TYPE: EM # XRF, EPMA, 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 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: 1a2a3a4a # GDS19 # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns