TITLE: Heulandite GDS3 Zeolite DESCRIPT

DOCUMENTATION_FORMAT: MINERAL

SAMPLE_ID: GDS3

MINERAL_TYPE: Tectosilicate

MINERAL: Heulandite (Zeolite group)

FORMULA: (Na,Ca)2-3Al3(Al,Si)2Si13O36*12H2O

FORMULA_HTML: (Na,Ca)2-3Al3(Al,Si)2Si13O36•12H2O

COLLECTION_LOCALITY: Poona, 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:

Zeolites of the heulandite group
Probably a mixture of compositions....best match is clinoptilolite

Konnert, Judith and Marta Flohr, 1992, unpublished data, USGS Reston, VA.

END_XRD_ANALYSIS.

COMPOSITIONAL_ANALYSIS_TYPE: None # XRF, EM(WDS), ICP(Trace), WChem

COMPOSITION_TRACE:

COMPOSITION_DISCUSSION:

None

END_COMPOSITION_DISCUSSION.

MICROSCOPIC_EXAMINATION:

Bimodal Grain Size Distribution:
mode 1: 176 µm @ 50 vol%
mode 2: 40 µm @ 50 vol%

avg gr sz = 128 µm

Low relief, one good cleavage, biaxial (+), refractive index < glycerin. No contaminants, sample very clean. All this is consistent with this sample being heulandite or clinoptilolite. G. Swayze.

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 2143 0.2-3.0µm 200 g.s.= 128 µm

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

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