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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: Acid_Mine_Dr Assemb1-Fe3+ DESCRIPT

DOCUMENTATION_FORMAT: MIXTURE

SAMPLE_ID: Assemb1-Fe3

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

MIXTURE: Secondary Fe-mineral precipitates coating rock surface

FORMULA: unknown

FORMULA_HTML: unknown

COLLECTION_LOCALITY: Stray Horse Gulch, Leadville, Colorado, USA

ORIGINAL_DONOR: Gregg Swayze

COLLECTION_LATITUDE: unknown # degrees and decimal minutes (N or S)

COLLECTION_LONGITUDE: unknown # degrees and decimal minutes (W or E)

DATUM: unknown # coordinate datum

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

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

SAMPLE_DESCRIPTION:

Sample is of a Fe-mineral precipitate on a rock in Stray Horse Gulch in the Leadville Mining District of Colorado, USA. This coating formed on the rock as a result of acid mine drainage from a nearby tailing and waste rock pile.

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

none

END_XRD_ANALYSIS.

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

none

COMPOSITION_TRACE: None

COMPOSITION_DISCUSSION:

none

END_COMPOSITION_DISCUSSION.

MICROSCOPIC_EXAMINATION:

none

END_MICROSCOPIC_EXAMINATION.

SPECTROSCOPIC_DISCUSSION:

Spectrum has a strong absorption edge and broad Fe-absorption at 0.99 microns with an overall provide similar to ferrihydrite. 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 7086 0.2-3.0µm 200 g.s.=


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