Alunite NH4+Jaro

Spectrum Details

Modality

FTIR

Category

soil

Material Type

Intimate

Sample ID

NMNH145596

Collection Locality

Geyers, California

Spectral Purity

1b2b3b4_ # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns

Composition / XRD

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

Sample Description

The sample was a physical mixture of ammonioalunite, ammoniojarosite and amorphous silica. IMAGE_OF_SAMPLE:

XRD Analysis

40 kV - 30 mA, 7.0-9.5 keV File: amalnite.out, -.mdi References: JCPDS #42-1334, 26-1014 Found: Ammonioalunite > ammoniojarosite; strong unidentified reflection at 2.34 angstroms Comment: Optically (in oil of refractive index 1.58) both the bulk sample and the sample used for the X-ray pattern appear to be composed on one phase of refractive index approximately 1.58. The c cell dimension of the jarosite is greater than that of Na-jarosite (compare GDS100, GDS101) and K-jarosite (compare GDS99), thus this jarosite is designated ammoniojarosite J.S. Huebner, J. Pickrell, T. Schaefer, written communication (USGS)

X Units

cm⁻¹

Y Units

Absorbance

Data Points

1,801