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: Stilbite GDS8 Zeolite DESCRIPT

DOCUMENTATION_FORMAT: MINERAL

SAMPLE_ID: GDS8

MINERAL_TYPE: Tectosilicate

MINERAL: Stilbite (Zeolite group)

FORMULA: NaCa2Al5Si13O36*14H2O

FORMULA_HTML: NaCa₂Al₅Si₁₃O₃₆•14H₂O

COLLECTION_LOCALITY: Nasik, India

ORIGINAL_DONOR: Wards Scientific

CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

SAMPLE_DESCRIPTION:

The sample appears white and to be spectrally pure.

IMAGE_OF_SAMPLE:

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

Primarily a zeolite of the heulandite group - best match is stellerite, but this isn't definitive.

Konnert, Judith and Marta Flohr, 1992, unpublished data, USGS Reston, VA.

Stilbite is also a member of the heulandite group.

40 kV - 30 mA, 6.5-9.5 keV
File: stilbite.out, -.mdi
References: JCPDS #24-894
Found: Stilbite

Comment: Very well crystallized phase. Expected to observe the (-201) reflection, but did not. Did observe some unexpected peak splitting not shown in the JCPDS listing. JCPDS listing does not exceed 35.8 degrees 2 theta for CuK alpha, so any additional phase having reflections only above 35.8 degrees could not be detected without further work. Stilbite has fibrous habit; this material is granular.

J.S. Huebner, J. Pickrell, T. Schaefer, written communication(USGS)

END_XRD_ANALYSIS.

COMPOSITIONAL_ANALYSIS_TYPE: # XRF, EPMA, ICP(Trace), WChem

COMPOSITION_TRACE:

COMPOSITION_DISCUSSION:

END_COMPOSITION_DISCUSSION.

MICROSCOPIC_EXAMINATION:

END_MICROSCOPIC_EXAMINATION.

SPECTROSCOPIC_DISCUSSION:

END_SPECTROSCOPIC_DISCUSSION.

SPECTRAL_PURITY: 1b2b3b4_ # GDS8 # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns