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Clark et. al. 2003 USGS Open File Report 03-395
Spectral Library splib05a Sample Description

(For further information on spectrsocopy, see: http://speclab.cr.usgs.gov)

TITLE: Gyp.4+jr20+msc.2+dic.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, EM(WDS), 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

LIB_SPECTRA_HED: where Wave Range Av_Rs_Pwr Comment
LIB_SPECTRA: splib05a r 8238 0.2-3.0µm 200 g.s.=


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