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(For further information on spectrsocopy, see:
http://speclab.cr.usgs.gov)
TITLE: Pectolite NMNH94865 DESCRIPT
DOCUMENTATION_FORMAT: MINERAL
SAMPLE_ID: NMNH94865
MINERAL_TYPE: Inosilicate
MINERAL: Pectolite
FORMULA: NaCa2Si3O8(OH)
FORMULA_HTML: NaCa2Si3O8(OH)
COLLECTION_LOCALITY: Thetford, Ontario, Canada
ORIGINAL_DONOR: Smithsonian Institution
CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
SAMPLE_DESCRIPTION:
Forms series with Serandite.
"Results of petrographic examination: Hand specimen consists of one small (1mm x 1cm) and one larger (5mm x 6mm x 1cm) fragment. The larger one has a large area of albite (1/4 of the sample). The rest is composed of pectolite needles. Under petrographic microscope, sample has 2% of an isotropic mineral. Fibrous nature of mineral precludes effective sieving. Fine fraction separated from coarse fraction by elutriation in acetone."
Salisbury, J. W., Walter, L. W., and Vergo, N., 1987, Mid-Infrared (2.1-25µm) Spectra of Minerals: First Edition, U.S. Geological Survey Open File Report 87-263.
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
Pure pectolite.
Salisbury, J. W., Walter, L. W., and Vergo, N., 1987, Mid-Infrared (2.1-25µm) Spectra of Minerals: First Edition, U.S. Geological Survey Open File Report 87-263.
Pure (Norma Vergo).
END_XRD_ANALYSIS.
COMPOSITIONAL_ANALYSIS_TYPE: EM (WDS) # XRF, EM(WDS), ICP(Trace), WChem
| COMPOSITION KEYWORD |
Oxide ASCII |
Amount | Weight Percent, % |
Oxide html |
|---|---|---|---|---|
| COMPOSITION: | SiO2 | 53.37 | wt% | SiO2 |
| COMPOSITION: | TiO2 | 0.01 | wt% | TiO2 |
| COMPOSITION: | Al2O3 | 0.03 | wt% | Al2O3 |
| COMPOSITION: | FeO | 0.11 | wt% | FeO |
| COMPOSITION: | MnO | 0.03 | wt% | MnO |
| COMPOSITION: | MgO | 0.03 | wt% | MgO |
| COMPOSITION: | CaO | 33.84 | wt% | CaO |
| COMPOSITION: | Na2O | 9.61 | wt% | Na2O |
| COMPOSITION: | K2O | 0.01 | wt% | K2O |
| COMPOSITION: | Total | 94.04 | wt% |
COMPOSITION_TRACE: None
COMPOSITION_DISCUSSION:
Microprobe analysis found the sample homogeneous within and between grains of pectolite. Average of 8 samples.
Salisbury, J. W., Walter, L. W., and Vergo, N., 1987, Mid-Infrared (2.1-25µm) Spectra of Minerals: First Edition, U.S. Geological Survey Open File Report 87-263.
END_COMPOSITION_DISCUSSION.
MICROSCOPIC_EXAMINATION:
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 3831 | 0.2-3.0µm | 200 | g.s.= crs gr |
| LIB_SPECTRA: | splib04a r 3841 | 0.2-3.0µm | 200 | g.s.= fm gr |
| LIB_SPECTRA: | splib05a r 5353 | 0.2-3.0µm | 200 | g.s.= |
| LIB_SPECTRA: | splib05a r 5365 | 0.2-3.0µm | 200 | g.s.= |
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