Sample Description USGS Spectral Library Version 7

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
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TITLE: Calcite.7+Kaolwxl.3 AMX9 DESCRIPT

DOCUMENTATION_FORMAT: MIXTURE

SAMPLE_ID: AMX9

MIXTURE_TYPE: Areal

MIXTURE: 70% Calcite WS272 + 30% Kaolinite KGa-1

FORMULA: CaCO3, Al2Si2O5(OH)4

FORMULA_HTML: CaCO₃
Al₂Si₂O₅(OH)₄

COLLECTION_LOCALITY: (Tunguska, Siberia, USSR), (Washington county, Georgia)

ORIGINAL_DONOR: (Wards Scientific), (Clay Mineral Society).

COLLECTION_LATITUDE: Not Available # degrees and decimal minutes (N or S)

COLLECTION_LONGITUDE: Not Available # degrees and decimal minutes (W or E)

DATUM: Not Available # coordinate datum

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

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

SAMPLE_DESCRIPTION:

Sample is a calculated linear mixture of calcite and well-crystallized kaolinite constructed from spectra of the pure minerals.

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

See Calcite WS272 and Kaolinite KGa-1

END_XRD_ANALYSIS.

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

COMPOSITION_TRACE: None

COMPOSITION_DISCUSSION:

See Calcite WS272 and Kaolinite KGa-1

END_COMPOSITION_DISCUSSION.

MICROSCOPIC_EXAMINATION:

See Calcite WS272 and Kaolinite KGa-1

END_MICROSCOPIC_EXAMINATION.

SPECTROSCOPIC_DISCUSSION:

Spectrum has absorptions characteristic of calcite and kaolinite. In the 2 - 2.5 micron region the calcite absorption at 2.3389 micron dominates the spectrum partially concealing the entire kaolinite doublet band at 2.2068 microns.

END_SPECTROSCOPIC_DISCUSSION.

SPECTRAL_PURITY: 1a2_3_4_ # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns