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: Gaylussite NMNH102876-2 DESCRIPT

DOCUMENTATION_FORMAT: MINERAL

SAMPLE_ID: NMNH102876-2

MINERAL_TYPE: Hydrous Carbonate

MINERAL: Gaylussite

FORMULA: Na2Ca(CO3)2*5H2O

FORMULA_HTML: Na₂Ca(CO₃)₂•5H₂O

COLLECTION_LOCALITY: Searles Lake, California

ORIGINAL_DONOR: Jim Crowley

CURRENT_SAMPLE_LOCATION: USGS Reston, Virginia

ULTIMATE_SAMPLE_LOCATION: USGS Reston, Virginia

SAMPLE_DESCRIPTION:

Spectrum originally published in: Crowley, J.K., 1991, Visible and Near-Infrared (0.4 - 2.5µm) Reflectance Spectra of Playa Evaporite Minerals: Journal of Geophysical Research, vol 96, no.B10, p. 16,231-16,240.

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

Pure gaylussite (Crowley, 1991)

END_XRD_ANALYSIS.

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

COMPOSITION_TRACE: None

COMPOSITION_DISCUSSION:

This spectrum appears to have subdued features at wavelengths past 1.5 µm compared to the spectrum published in Crowley (1991) which may be due to the incomplete drying of the sample after crushing or the presence of fluid inclusions. G. Swayze

END_COMPOSITION_DISCUSSION.

MICROSCOPIC_EXAMINATION:

END_MICROSCOPIC_EXAMINATION.

SPECTROSCOPIC_DISCUSSION:

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:	splib04a r 1729	0.2-3.0µm	200	g.s.=
LIB_SPECTRA:	splib05a r 2782	0.2-3.0µm	200	g.s.=

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