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: Gyp.4+jr20+msc.2+dickite 2 AMX23 DESCRIPT

DOCUMENTATION_FORMAT: MIXTURE

SAMPLE_ID: AMX23

MIXTURE_TYPE: Areal

MIXTURE: Gypsum, Jarosite, Muscovite, Dickite

FORMULA: CaSO4*2H2O + K(Fe+3)3(SO4)2(OH)6 + KAl2Si3O10(OH)2 + Al2Si2O5(OH)4

FORMULA_HTML: CaSO₄•2H₂0 + KFe⁺³₃(SO₄)₂(OH)₆
+ KAl₂Si₃O₁₀(OH)₂ + Al₂Si₂O₅(OH)₄

COLLECTION_LOCALITY: (Washington County, Utah), (Synthetic), (somewhere in Brazil), (Red Mt. Colorado).

ORIGINAL_DONOR: (Hunt & Salisbury Collection), (Roger Stroffregen, SMU), (C.V. Clemency, SUNY), (National Museum of Natural History).

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:

Areal mix of 40% gypsum (HS333), 20% K jarosite (GDS99), 20% medium-high Al muscovite (GDS113), and 20% dickite (NMNH106242).

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

See: Gypsum (HS333), K Jarosite (GDS99), Medium-High Al Muscovite (GDS113), Dickite (NMNH106242).

END_XRD_ANALYSIS.

COMPOSITIONAL_ANALYSIS_TYPE: none # XRF, EPMA, ICP(Trace), WChem

COMPOSITION_TRACE: None

COMPOSITION_DISCUSSION:

See: Gypsum (HS333), K Jarosite (GDS99), Medium-High Al Muscovite (GDS113), Dickite (NMNH106242).

END_COMPOSITION_DISCUSSION.

MICROSCOPIC_EXAMINATION:

See: Gypsum (HS333), K Jarosite (GDS99), Medium-High Al Muscovite (GDS113), Dickite (NMNH106242).

END_MICROSCOPIC_EXAMINATION.

SPECTROSCOPIC_DISCUSSION:

Spectrum has absorptions characteristic of all mixture phases to varying degrees. Jarosite has its typical Fe-absorptions in visible out to 1.2 microns with a weak band at 2.2664 micron. Gypsum has it triplet in the 1.4 - 1.5 micron region and the dickite doublet at 2.2 microns has superimposed muscovite absorption.

END_SPECTROSCOPIC_DISCUSSION.

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