Alunite RES-9 Summitv (400C)

Spectrum Details

Modality

NIR

Category

mineral

Material Type

Sulfate

Sample ID

RES-9

Collection Locality

Summitville, Colorado, USA

Spectral Purity

1b2b3_4_ # 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

Alunite RES-9 (XNa=68 and XNa=23) Sample is from the Summitville Mine in SW Colorado, probably from drill core samples. Sample composition is 40 mole % Na from atomic absorption analysis, but X-ray diffraction analysis indicates two alunite phases of XNa=68 and 23. See: Stroffregen, R.E., and C.N. Alpers, Observations on the unit-cell dimensions, H2O contents, and &#948D values of natural and synthetic alunite, American Mineralogist, 77, 1092-1098, 1992. IMAGE_OF_SAMPLE:

XRD Analysis

X-ray analysis indicates two alunite phases present in sample. One has XNa=68 and the other XNa=23. see: Stroffregen, R., and Alpers, C., 1992, Observations on the unit-cell dimensions, H2O contents and &#948D values of natural and synthetic alunite: American Mineralogist, v.77, p. 1092-1098. Major components include alunite and quartz with trace amounts of kaolinite and rutile. B. Benzel.

X Units

cm⁻¹

Y Units

Absorbance

Data Points

2,126