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Konnert, Judith and Marta Flohr, 1992, unpublished data, USGS Reston, VA.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: 1_2_3_4_

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 ____ 0.2-3.0µm 200 g.s.=

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