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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: 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.

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Konnert, Judith and Marta Flohr, 1992, unpublished data, USGS Reston, VA.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, EM(WDS), ICP(Trace), WChem

COMPOSITION_TRACE:

COMPOSITION_DISCUSSION:

END_COMPOSITION_DISCUSSION.

MICROSCOPIC_EXAMINATION:

END_MICROSCOPIC_EXAMINATION.

SPECTROSCOPIC_DISCUSSION:

END_SPECTROSCOPIC_DISCUSSION.

SPECTRAL_PURITY: 1b2_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 4625 0.2-3.0µm 200 g.s.=
LIB_SPECTRA: splib05a r 6414 0.2-3.0µm 200 g.s.=


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