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(For further information on spectrsocopy, see:
http://speclab.cr.usgs.gov)
TITLE: Ferrihydrite GDS75 Sy, F6 DESCRIPT
DOCUMENTATION_FORMAT: MINERAL
SAMPLE_ID: GDS75 (F6)
MINERAL_TYPE: Oxide
MINERAL: Ferrihydrite (Synthetic)
FORMULA: 5(Fe+3)2O3*9H2O
FORMULA_HTML: 5Fe+32O3•9H2O
COLLECTION_LOCALITY: Synthetic
ORIGINAL_DONOR: Dave Sherman
CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
SAMPLE_DESCRIPTION:
This sample is one of a series of ferrihydrite samples made by Dave Sherman for the following paper:
Sherman, D.M., R.G. Burns, and V.M. Burns, 1982, Spectral characteristics of the iron oxides with application to the Martian bright region mineralogy. Journal of Geophysical Research, v. 87, n. B12, pp. 10169- 10180. (F6 is Dave Sherman's number)
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
the sample is x-ray amorphous - G. Swayze and Ken Esposito.
40 kV - 30mA, 7.3-9.5 kev
File: fehyd75.mdi (smear mount on quartz plate)
References: JCPDS #29-712
Found: Amorphous to CuKalpha X-radiation
Comment: Pattern has a high background but no significant
reflections. A weak, very broad maximum is centered around 2.6
angstroms (Fe-O bond?); an even weaker broad maximum centered about
1.50 angstroms could be a sample response or an instrumental
effect.
END_XRD_ANALYSIS.
COMPOSITIONAL_ANALYSIS_TYPE: # XRF, EM(WDS), ICP(Trace), WChem
COMPOSITION_TRACE:
COMPOSITION_DISCUSSION:
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 1647 | 0.2-3.0µm | 200 | g.s.= |
| LIB_SPECTRA: | splib05a r 2688 | 0.2-3.0µm | 200 | g.s.= |
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