Ferrihydrite

Spectrum Details

Modality

NIR

Category

mineral

Material Type

Oxide

Sample ID

GDS75 (F6)

Collection Locality

Synthetic

Spectral Purity

1b2_3_4_ # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns

Composition / XRD

# XRF, EPMA, ICP(Trace), WChem

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:

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.

X Units

cm⁻¹

Y Units

Absorbance

Data Points

2,126