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(For further information on spectrsocopy, see:
http://speclab.cr.usgs.gov)
TITLE: Stilbite HS482 Zeolite DESCRIPT
DOCUMENTATION_FORMAT: MINERAL
SAMPLE_ID: HS482
MINERAL_TYPE: Tectosilicate
MINERAL: Stilbite (Zeolite Group)
FORMULA: NaCa2Al5Si13O36*14H2O
FORMULA_HTML: NaCa2Al5Si13O36•14H2O
COLLECTION_LOCALITY: Nova Scotia
ORIGINAL_DONOR: Hunt and Salisbury Collection
CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
SAMPLE_DESCRIPTION:
A spectrum for this sample was published in: 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.
With the note: "The major water features occur at 0.985, 1.17, 1.44, 1.92µm and the bands are generally broad and not well resolved. The reflectivities for sizes I through IV are 98, 91, 79, and 62% at 1.1µm.
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
40 kV- 30 mA, 6.5-9.5 keV
File: stilb482.mdi
References: Tschernich (1992); PDF2 #24-0894, 25-0124, 26-584, 29-1185, 41-1356,
41-1357, 44-1479; Akizuki and Konno (1985)
Found: Barrierite, stellerite, or stilbite
Comments: Sharp peaks but poorly resolved alpha1-alpha2 reflections are consistent
with some variation in composition or structural order. The pattern was indexed by
comparison with PDF2 #26-0584 (stilbite, calculated by D. Smith et al., 1970).
A moderately weak shoulder on the larger d-spacing side of the (020) is the only
unexplained feature. Line-base search-match returns barrierite, stellerite, and
stibite; profile-based search-match returns only barrierite. These three species
are so closely related that they might all better be considered stilbite
(Tschernich, 1992). Visual comparison of overlaid patterns indicates that
barrierite (29-1185), stellerite (25-0124), and stilbite (44-1479)are each an
excellent match for HS-482. Another stilbite (24-0894) and structurally related
heulandite and brewsterite are poor matches and were eliminated as possibilities.
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: 1b2_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 4635 | 0.2-3.0µm | 200 | g.s.= |
| LIB_SPECTRA: | splib05a r 6426 | 0.2-3.0µm | 200 | g.s.= |
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