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: 1_2_3_4_

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 ____ 0.2-3.0µm 200 g.s.=

LIB_SPECTRA: splib06a r ____ 1.5-25µm 250 g.s.=