Clark and others 2007 USGS Data Series 231
Spectral Library splib06a Sample Description

(For further information on spectroscopy, 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)

IMAGE_OF_SAMPLE:

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.=
LIB_SPECTRA:	splib06a r 7822			g.s.=