U.S. Geological Survey home page

USGS Spectral Library Version 7 Sample Description

Kokaly, R.F., Clark, R.N., Swayze, G.A., Livo, K.E., Hoefen, T.M., Pearson, N.C., Wise, R.A., Benzel, W.M., Lowers, H.A., Driscoll, R.L., and Klein, A.J., 2017, USGS Spectral Library Version 7: U.S. Geological Survey Data Series 1035, 61 p., https://doi.org/10.3133/ds1035
For more information on the library, see: local link web link

TITLE: Alum. 33+ Kaol. 33+ Musc. 33 AMX2 DESCRIPT

DOCUMENTATION_FORMAT: MIXTURE

SAMPLE_ID: AMX2

MIXTURE_TYPE: Areal

MIXTURE: Alunite HS295.3B+ well crystallized Kaolinite KGa-1+Muscovite CU91-250A

FORMULA: KAl3(SO4)2(OH)6 + Al2Si4O10(OH)2 + KAl2[AlSi3O10](OH,F)2

FORMULA_HTML: KAl3(SO4)2(OH)6 +Al2 Si4O10(OH)2 + KAl2[AlSi3O10] (OH,F)2

COLLECTION_LOCALITY: See Alunite HS295.3B, Kaolinite KGa-1, Muscovite CU91-250A

ORIGINAL_DONOR: See Alunite HS295.3B, Kaolinite KGa-1, Muscovite CU91-250A

CURRENT_SAMPLE_LOCATION: U.S.G.S. Denver Spectroscopy Laboratory.

ULTIMATE_SAMPLE_LOCATION: U.S.G.S. Denver Spectroscopy Laboratory.

SAMPLE_DESCRIPTION:

Alun. 33% +Kaol 33% + Musc 33% See HS295.3B, KGa-1 and CU91-250A

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

See HS295.3B, KGa-1 and CU91-250A

see:

END_XRD_ANALYSIS.

COMPOSITIONAL_ANALYSIS_TYPE: EPMA # XRF, EPMA, ICP(Trace), WChem

See HS295.3B, KGa-1 and CU91-250A

COMPOSITION_TRACE: None

COMPOSITION_DISCUSSION:

See HS295.3B, KGa-1 and CU91-250A

END_COMPOSITION_DISCUSSION.

MICROSCOPIC_EXAMINATION:

See HS295.3B, KGa-1 and CU91-250A

END_MICROSCOPIC_EXAMINATION.

SPECTROSCOPIC_DISCUSSION:

Spectrum resembles that of halloysite in the 2.2 micron region but has strong alunite absorptions near 1.45 and 1.7 microns.

END_SPECTROSCOPIC_DISCUSSION.

SPECTRAL_PURITY: 1a2_3_4_ # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns
See HS295.3B, KGa-1 and CU91-250A