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(For further information on spectrsocopy, see:
http://speclab.cr.usgs.gov)
TITLE: Natrolite HS169 DESCRIPT
DOCUMENTATION_FORMAT: MINERAL
SAMPLE_ID: HS169
MINERAL_TYPE: Tectosilicate
MINERAL: Natrolite (Zeolite group)
FORMULA: Na2Al2Si3O10*2H20
FORMULA_HTML: Na2Al2Si3O10•2H2O
COLLECTION_LOCALITY: Poonah, India
ORIGINAL_DONOR: Hunt and Salibury Collection
CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
SAMPLE_DESCRIPTION:
Dimorphous with Tetranantrolite.
"T-22 Natrolite 169B--Poonah, India. Na2Al2Si3O102H2O: The spectral features in this sample are very well resolved and the spectrum displays multiple sharp and weak features, all due to H2O throughout the entire mid- infrared. The main features are at 0.98µ, 1.19µ, 1.46µ, 1.95µ, 2.2µ, and 2.44µ. The differences in these natrolite spectra indicate that the water is less randomly located in the Poonah sample than in the Springfield sample."
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:
Pure natrolite. (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:
100 vol% Natrolite
trace Fe-oxide scale
average grain size= 225 µm
Some clear grains 10% vol, the rest are cloudy white. Grains have micron sized fluid or gas inclusions comprising 40 vol% of zeolite grains. Cannot get optic sign. Low relief grains with straight extinction, and sub-rounded habit (not fibrous). These properties are consistent with this sample being natrolite. G. Swayze.
END_MICROSCOPIC_EXAMINATION.
SPECTROSCOPIC_DISCUSSION:
END_SPECTROSCOPIC_DISCUSSION.
SPECTRAL_PURITY: 1a2_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 3407 | 0.2-3.0µm | 200 | g.s.= 225 µm |
| LIB_SPECTRA: | splib05a r 4866 | 0.2-3.0µm | 200 | g.s.= |
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