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DOCUMENTATION_FORMAT: MIXTURE
SAMPLE_ID: Assemb2-Fe3+
MIXTURE_TYPE: Intimate
MIXTURE: Secondary Fe-mineral precipitates coating rock surface
FORMULA: unknown
FORMULA_HTML: unknown
COLLECTION_LATITUDE: unknown # degrees and decimal minutes (N or S)
COLLECTION_LONGITUDE: unknown # degrees and decimal minutes (W or E)
DATUM: unknown # coordinate datum
COLLECTION_LOCALITY: Stray Horse Gulch, Leadville, Colorado, USA
ORIGINAL_DONOR: Gregg Swayze
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, EPMA, ICP(Trace), WChem
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 0.94 microns with an overall provide similar to Schwertmannite.
END_SPECTROSCOPIC_DISCUSSION.
SPECTRAL_PURITY: 1b2_3_4_ # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns