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(For further information on spectrsocopy, see:
http://speclab.cr.usgs.gov)
TITLE: Natrolite+Zeolites HS168 DESCRIPT
DOCUMENTATION_FORMAT: MINERAL
SAMPLE_ID: HS168
MINERAL_TYPE: Tectosilicate
MINERAL: Natrolite + Zeolites (Zeolite group)
FORMULA: Na2Al2Si3O10*2H20
FORMULA_HTML: Na2Al2Si3O10•2H2O
COLLECTION_LOCALITY: Springfield, Oregon
ORIGINAL_DONOR: Hunt and Salibury Collection
CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
SAMPLE_DESCRIPTION:
Dimorphous with Tetranatrolite.
"T-21 Natrolite 168B--Springfield, Ore. Na2Al2- Si3O10.2H2O: This Zeolite occurs in cavities in basalt's and related rocks and also as an alteration product of nepheline, sodalite or plagioclase. Its major features occur at 0.85µ, 1.165µ, 1.44µ, and 1.95µ. These bands are considerably sharper than in the stilbite."
Hunt, G.R., J.W. Salisbury, and C.J. Lenhoff, 1973, Visible and near-infrared spectra of minerals and rocks: VI. Additional silicates. Modern Geology, v. 4, p. 85-106.
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
Natrolite + large amount of analcime + small amount of clinoptilolite + large amount other. (Norma Vergo)
Spectrally contaminated by other zeolites. (Norma Vergo)
END_XRD_ANALYSIS.
COMPOSITIONAL_ANALYSIS_TYPE: None # XRF, EM(WDS), ICP(Trace), WChem
COMPOSITION_TRACE: None
COMPOSITION_DISCUSSION:
None
END_COMPOSITION_DISCUSSION.
MICROSCOPIC_EXAMINATION:
mode:
40 vol% Natrolite
30 vol% Analcime (isotropic, low relief, conchoidal fracture)
20 vol% Clinoptilolite
10 vol% Calcite
trace Fe-oxide scale
Not many gas or fluid inclusions in natrolite. Straight extinction, prismatic habit, length slow, all properties consistent with natrolite. Clear conchoidally fractured grains have low relief, 1st order gray (nearly isotropic), undulose extinction, and rutile inclusions, and are probably analcime grains. Flat blades with length slow character are probably Clinoptilolite. Calcite fizzes in HCl. This sample is very contaminated in a modal sense. G. Swayze.
END_MICROSCOPIC_EXAMINATION.
SPECTROSCOPIC_DISCUSSION:
END_SPECTROSCOPIC_DISCUSSION.
SPECTRAL_PURITY: 1c2_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 3418 | 0.2-3.0µm | 200 | g.s.= 180 µm |
| LIB_SPECTRA: | splib05a r 4889 | 0.2-3.0µm | 200 | g.s.= |
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