Lepidocrocite

Spectrum Details

Modality

FTIR

Category

mineral

Material Type

Hydroxide

Sample ID

GDS80

Collection Locality

Synthetic, Dave Sherman

Spectral Purity

1b2b3b4u # GDS80 # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns

Composition / XRD

None # XRF, EPMA, ICP(Trace), WChem COMPOSITION_TRACE:

Sample Description

Polymorphous with Akaganeite, Feroxyhyte, and Goethite. "This sample was synthesized by aerial oxidation of a FeCl2 solution at a pH or 6-7. The X ray diffraction pattern of this sample was extremely well-defined, implying a high degree of crystallinity." The above description may apply to this sample. This sample was one of a series of samples made 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. IMAGE_OF_SAMPLE:

XRD Analysis

40 kV - 30 mA, 7.3-9.5 keV File: lepicr80.out, -.mdi Reference: JCPDS #8-98, 29-713 Found: lepidocrocite and goethite in subequal proportions Sought: quartz (see comment) Comment: Poorly crystallized: weak, broad reflections for both oxides. The goethite (110) and lepidocrocite (120) reflections are in the positions of the quartz (100) and (101) reflections and would prevent X-ray powder detection of a small amount of quartz, if present. J.S. Huebner, J. Pickrell, T. Schaefer, written communication 1994, Reston, VA.

X Units

cm⁻¹

Y Units

Absorbance

Data Points

1,801