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(For further information on spectroscopy, see:
http://speclab.cr.usgs.gov)
TITLE: Roscoelite EN124 DESCRIPT
DOCUMENTATION_FORMAT: MINERAL
SAMPLE_ID: EN124
MINERAL_TYPE: Phyllosilicate
MINERAL: Roscoelite (vanadium mica) (Mica group)
FORMULA: KV2(AlSi3O10)(OH)2
FORMULA_HTML: KV2(AlSi3O10)(OH)2
COLLECTION_LOCALITY: Carpenter Mine, along Bear Creek in SW Colorado, Sec 33 T43N R10W, Long 107 58' 45" Lat 37 56' 40" 600 feet from the portal of the Carpenter Mine
ORIGINAL_DONOR: George Breit
CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
SAMPLE_DESCRIPTION:
Less than 2 µm clay separate prepared from a sample of V-U ore from the Late Jurassic Entrada Sandstone.
IMAGE_OF_SAMPLE:
NO PHOTO
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
Illite and illite-smectite with < 15% smectite interlayers. No other minerals were detected (personal communication from G. Breit, 1990)
END_XRD_ANALYSIS.
COMPOSITIONAL_ANALYSIS_TYPE: Unknown # XRF, EM(WDS), ICP(Trace), WChem
| COMPOSITION KEYWORD |
Oxide ASCII |
Amount | Weight Percent, % |
Oxide html |
|---|---|---|---|---|
| COMPOSITION: | TiO2 | 0.12 | wt% | TiO2 |
| COMPOSITION: | Al2O3 | 27.2 | wt% | Al2O3 |
| COMPOSITION: | Cr2O3 | less than 0.02 | wt% | Cr2O3 |
| COMPOSITION: | V2O3 | 10.0 | wt% | V2O3 |
| COMPOSITION: | Fe2O3 | *0.66 | wt% | Fe2O3 |
| COMPOSITION: | MnO | 0.01 | wt% | MnO |
| COMPOSITION: | MgO | 0.64 | wt% | MgO |
| COMPOSITION: | Na2O | 0.04 | wt% | Na2O |
| COMPOSITION: | K2O | 9.07 | wt% | K2O |
| COMPOSITION: | Total | 47.76 | wt% |
COMPOSITION_TRACE: Ca < 20 ppm
COMPOSITION_DISCUSSION:
* All Fe reported given as total Fe wt% (includes both FeO and Fe2O3.
Done by George Breit.
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 4273 | 0.2-3.0µm | 200 | g.s.= |
| LIB_SPECTRA: | splib05a r 6001 | 0.2-3.0µm | 200 | g.s.= |
| LIB_SPECTRA: | splib06a r 19682 | g.s.= |