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(For further information on spectroscopy, see:
http://speclab.cr.usgs.gov)
TITLE: Dipyre BM1959,505 Scapolite DESCRIPT
DOCUMENTATION_FORMAT: MINERAL
SAMPLE_ID: BM1959,505
MINERAL_TYPE: Tectosilicate
MINERAL: Dipyre (Scapolite group)
FORMULA: 3NaAlSi3O8*NaCl
FORMULA_HTML: 3NaAlSi3O8•NaCl
COLLECTION_LOCALITY: Unknown
ORIGINAL_DONOR: National Museum of Natural History
CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
SAMPLE_DESCRIPTION:
Scapolites are metamorphic minerals with compositions suggestive of the feldspars. Dipyre is an intermediate composition of the solid solution series marialite-wernerite-meionite.
Two spectra are in the library, one of the original sample, and one after HL separation.
IMAGE_OF_SAMPLE:
NO PHOTO
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
Scapolite + muscovite + 3.66, 3.36, 2.87, 2.838 Angstroms
END_XRD_ANALYSIS.
COMPOSITIONAL_ANALYSIS_TYPE: EM # XRF, EM(WDS), ICP(Trace),WChem
| COMPOSITION KEYWORD |
Oxide ASCII |
Amount | Weight Percent, % |
Oxide html |
|---|---|---|---|---|
| COMPOSITION: | SiO2 | 56.8600 | wt% | SiO2 |
| COMPOSITION: | TiO2 | 0.00 | wt% | TiO2 |
| COMPOSITION: | Al2O3 | 22.8100 | wt% | Al2O3 |
| COMPOSITION: | FeO | 0.0660 | wt% | FeO |
| COMPOSITION: | MnO | 0.0100 | wt% | MnO |
| COMPOSITION: | MgO | 0.0100 | wt% | MgO |
| COMPOSITION: | CaO | 6.5780 | wt% | CaO |
| COMPOSITION: | Na2O | 9.7040 | wt% | Na2O |
| COMPOSITION: | K2O | 1.4000 | wt% | K2O |
| COMPOSITION: | Cl | 3.8920 | wt% | Cl |
| COMPOSITION: | F | 0.0220 | wt% | F |
| COMPOSITION: | SO3 | 0.0100 | wt% | SO3 |
| COMPOSITION: | CO2 | 0.1000 | wt% | CO2 |
| COMPOSITION: | Total | 101.4620 | wt% | |
| COMPOSITION: | O=Cl,F,S | .8875 | wt% | #correction for Cl, F, S |
| COMPOSITION: | New Total | 101.5745 | wt% |
COMPOSITION_TRACE:
None
COMPOSITION_DISCUSSION:
1. Mol % SiO2 includes .0196 mol % SiF4.
Mol % SiO2 includes 1.8555 mol % SiCl2.
2. Fe oxide in analysis is total Fe+2 + Fe+3.
3. Number of tetrahedral sites per formula set at 12.
4. Number of anions per formula unit = 25.03625.
5. Cation site assignments: Standard clay-mineral default with
changes.
Must occupy tetrahedral sites: Si Al
To big cation sites: Fe+2 Mn Mg
XMe = 25.70 % Me
XMe = Ca/(Ca+Na) = 27.2 % Me
Sample: Dipyre
END_COMPOSITION_DISCUSSION.
MICROSCOPIC_EXAMINATION:
Not done yet
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 1451 | 0.2-3.0µm | 200 | g.s.= |
| LIB_SPECTRA: | splib05a r 2441 | 0.2-3.0µm | 200 | g.s.= |
| LIB_SPECTRA: | splib06a r 7093 | g.s.= |