MINERAL: Stilbite (Zeolite group)
COLLECTION_LOCALITY: Nasik, India
ORIGINAL_DONOR: Wards Scientific
CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
The sample appears white and to be spectrally pure.
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Konnert, Judith and Marta Flohr, 1992, unpublished data, USGS Reston, VA.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
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)
COMPOSITIONAL_ANALYSIS_TYPE: # XRF, EPMA, ICP(Trace), WChem
SPECTRAL_PURITY: 1b2b3b4_ # GDS8 # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns