Clark and others 2007 USGS Data Series 231
Spectral Library splib06a Sample Description

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

TITLE: Desert_Varnish ANP90-14 DESCRIPT

DOCUMENTATION_FORMAT: MIXTURE

SAMPLE_ID: ANO90-14

MIXTURE_TYPE: Coating # Areal, Intimate, Coating, or Molecular

MIXTURE: Desert_Varnish

FORMULA: Na4Mn14O27*9H20 + alpha-Fe2O3 + clays

FORMULA_HTML: Na₄Mn₁₄O₂₇•9H₂O + alpha-Fe₂O₃

COLLECTION_LOCALITY: Arches National Park

ORIGINAL_DONOR: Greg Swayze

CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

SAMPLE_DESCRIPTION:

"Desert varnish invariably consists of birnessite in intimate mixture with hematite and large amounts of clay minerals. The clays are generally of the illite-montmorillonite type with minor kaolinite, but in several reversed."

Potter, R.M. and G.R. Rossman, 1979, Mineralogy of manganese dendrites and coatings. American Mineralogist, v.64, pp 1219-1226.

This sample is a coating on sandstone.

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

END_XRD_ANALYSIS.

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

COMPOSITION_TRACE: None

COMPOSITION_DISCUSSION:

END_COMPOSITION_DISCUSSION.

MICROSCOPIC_EXAMINATION:

END_MICROSCOPIC_EXAMINATION.

SPECTROSCOPIC_DISCUSSION:

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:	splib04a r 1374	0.2-3.0µm	200	g.s.=
LIB_SPECTRA:	splib05a r 9076	0.2-3.0µm	200	g.s.=
LIB_SPECTRA:	splib06a r 26705			g.s.=