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(For further information on spectroscopy, 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 shape similar to the spectrum of 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.= |
| LIB_SPECTRA: | splib06a r 23775 | g.s.= |