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(For further information on spectrsocopy, see:
http://speclab.cr.usgs.gov)
TITLE: Erionite+Offretite GDS72 DESCRIPT
DOCUMENTATION_FORMAT: Mixture
SAMPLE_ID: GDS72
MIXTURE_TYPE: Intimate
MIXTURE: Erionite + Offretite (Zeolite group)
FORMULA: (K2Na2Ca,Mg)2[Al4Si14O36]·15H2O + (K2,Ca)5[(Al10Si26)O72]·30H2O
FORMULA_HTML: (K2Na2Ca,Mg)2[Al4Si14O36]·15H2O and (K2,Ca)5[(Al10Si26)O72·30H2O
COLLECTION_LOCALITY: Durkee, Oregon
ORIGINAL_DONOR: Unknown
CURRENT_SAMPLE_LOCATION: USGS Spectroscopy sample collection library - Denver, Colorado
ULTIMATE_SAMPLE_LOCATION: USGS Spectroscopy sample collection library - Denver, Colorado
SAMPLE_DESCRIPTION:
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
Offretite - major component
Erionite - major component
No other identifiable components
Konnert, Judith and Marta Flohr, 1992, unpublished data, USGS Reston, VA.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: None
None
COMPOSITION_DISCUSSION:
None
END_COMPOSITION_DISCUSSION.
MICROSCOPIC_EXAMINATION:
mode:
95 vol% zeolite
5 vol% contaminant (high birefringence, uniaxial mineral not
included in grain size estimate)
avg. grain size = < 5 µm
Elongate prismatic grains (similar to prisms with pyramid terminations) have a very low refractive index. Fine grain size limits other optical determinations, but crystal habit and refractive index are consistent with this sample being a zeolite. G. Swayze.
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 1596 | 0.2-3.0µm | 200 | g.s.= |
| LIB_SPECTRA: | splib05a r 8128 | 0.2-3.0µm | 200 | g.s.= |
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