Alunite SUSTDA-20

Spectrum Details

Modality

NIR

Category

mineral

Material Type

Sulfate

Sample ID

SUSTDA-20

Collection Locality

Sulfur, NV

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 sieved to the grain size interval less than 250 µm. IMAGE_OF_SAMPLE: NO PHOTO

XRD Analysis

40 kV - 30 mA, 6.5-9.5 keV File: alun20_mdi, *.out (smear mount on quartz plate) References: JCPDS #41-1467; Huebner's reference patterns Found: Natroalunite and weak, unidentified reflections at 3.33, 2.90, 1.912, 1.719, 1.606, and 1.475 Angstroms Comment: Moderately sharp and well-formed peaks suggest only moderate crystallinity and compositional heterogeneity. Some alunite peak intensities do match the relative intensities of the reference patterns. J.S. Huebner, J. Pickrell, T. Schaefer, written communication 1994

X Units

cm⁻¹

Y Units

Absorbance

Data Points

2,126