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: Alunite+Pyrophyl SD1093A DESCRIPT

DOCUMENTATION_FORMAT: Mixture

SAMPLE_ID: SD1093A

MIXTURE_TYPE: Intimate

MIXTURE: Alunite, Pyrophyllite.

FORMULA: KAl3(SO4)2(OH)6 + Al2Si4O10(OH)2

FORMULA_HTML: KAl₃(SO₄)₂(OH)₆
Al₂Si₄O₁₀(OH)₂

COLLECTION_LOCALITY: Summitville, Colorado, USA

ORIGINAL_DONOR: Dana Bove

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

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

SAMPLE_DESCRIPTION:

Alunite + Pyrophyllite in an altered volcanic rock

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

None

END_XRD_ANALYSIS.

COMPOSITIONAL_ANALYSIS_TYPE: NONE # XRF, EM(WDS), ICP(Trace),WChem

COMPOSITION_TRACE: None

COMPOSITION_DISCUSSION:

END_COMPOSITION_DISCUSSION.

MICROSCOPIC_EXAMINATION:

None

END_MICROSCOPIC_EXAMINATION.

SPECTROSCOPIC_DISCUSSION:

Spectrum has strong absorption bands in the visible that resemble goethite in position and shape. The 2.17 micron alunite absorption has a sharp 2.1669 micron pyrophyllite absorption superimposed.

END_SPECTROSCOPIC_DISCUSSION.

SPECTRAL_PURITY: 1b2_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 7222	0.2-3.0µm	200	g.s.=

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