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(For further information on spectrsocopy, see:
http://speclab.cr.usgs.gov)
TITLE: Phlogopite WS496 DESCRIPT
DOCUMENTATION_FORMAT: MINERAL
SAMPLE_ID: WS496
MINERAL_TYPE: Phyllosilicate
MINERAL: Phlogopite (Mica group)
FORMULA: KMg3Si3AlO10(F,OH)2
FORMULA_HTML: KMg3Si3AlO10(F,OH)2
COLLECTION_LOCALITY: Mt. Vesuvius, Italy
ORIGINAL_DONOR: Ward's Scientific
CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
SAMPLE_DESCRIPTION:
Forms series with Biotite.
Original sample labeled as humite and phlogopite.
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
40 kV - 30 mA, 6.5-9.5 keV
File: phlog496.out, -.mdi (edge/random mount)
References: Bailey (1988, MSA Reviews 13); Huebner's reference patterns
Found: trioctahedral mica (3T or 1M polytype); very minor calcite.
Comment: Exceptionally sharp reflections suggest excellent crystallinity and compositional heterogeneity. It is difficult or impossible to distinguish 1M and 3T polytypes in powder diffraction patterns; WS-496 seem to match Bailey's 3T reference pattern intensities better than his 1M intensities. WS-496 is definitely not 2M1 polytype. The position of the (060) [or(30-30)] reflection is consistent with endmember phlogopite.
J.S. Huebner, J. Pickrell, T. Schaefer, written communication(USGS)
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 | 43.015 | wt% | SiO2 |
| COMPOSITION: | TiO2 | .075 | wt% | TiO2 |
| COMPOSITION: | Al2O3 | 11.605 | wt% | Al2O3 |
| COMPOSITION: | FeO | 3.444 | wt% | FeO |
| COMPOSITION: | MnO | .435 | wt% | MnO |
| COMPOSITION: | MgO | 29.624 | wt% | MgO |
| COMPOSITION: | CaO | .052 | wt% | CaO |
| COMPOSITION: | Na2O | .322 | wt% | Na2O |
| COMPOSITION: | K2O | 9.073 | wt% | K2O |
| COMPOSITION: | Cl | .005 | wt% | Cl |
| COMPOSITION: | F | 2.193 | wt% | F |
| COMPOSITION: | Total | 99.84 | wt% | |
| COMPOSITION: | O=Cl,F,S | wt% | #correction for Cl, F, S | |
| COMPOSITION: | New Total | wt% |
COMPOSITION_TRACE:
COMPOSITION_DISCUSSION:
Microprobe analysis by Gregg Swayze using USGS microprobe facility.
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 3885 | 0.2-3.0µm | 200 | g.s.= |
| LIB_SPECTRA: | splib05a r 5414 | 0.2-3.0µm | 200 | g.s.= |
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