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DOCUMENTATION_FORMAT: MIXTURE
SAMPLE_ID: SU93-106
MIXTURE_TYPE: Intimate
MIXTURE: Secondary Fe-minerals coating a rock
FORMULA: Unknown
FORMULA_HTML: Unknown
COLLECTION_LOCALITY: Alamosa River, Colorado, USA
ORIGINAL_DONOR: Gregg Swayze
COLLECTION_LATITUDE: Not Available # degrees and decimal minutes (N or S)
COLLECTION_LONGITUDE: Not Available # degrees and decimal minutes (W or E)
DATUM: Not Available # coordinate datum
CURRENT_SAMPLE_LOCATION: USGS Spectral Library Denver, Colorado
ULTIMATE_SAMPLE_LOCATION: USGS Spectral Library Denver, Colorado
SAMPLE_DESCRIPTION:
Sample was collected from the Alamosa River downstream from the Summitville mine about 1 year after a catastrophic release of metal-rich mine waste water from the mine. Collected about 15 kilometers downstream from the Mine. Sample is of secondary Fe-minerals coating a river cobble.
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
No Secondary Fe-minerals identified.
END_XRD_ANALYSIS.
COMPOSITIONAL_ANALYSIS_TYPE: NONE # XRF, EPMA, ICP(Trace), WChem
COMPOSITION_TRACE:
COMPOSITION_DISCUSSION:
None
END_COMPOSITION_DISCUSSION.
MICROSCOPIC_EXAMINATION:
None
END_MICROSCOPIC_EXAMINATION.
SPECTROSCOPIC_DISCUSSION:
Spectrum shows a strong absorption edge in the visible with a weak absorption at 0.9637 microns. This band position is compatible with goethites and schwertmannite. Lack of a band near 0.65 microns may indicate the sample is possibly schwertmannite or nanocrystalline goethite or both.
END_SPECTROSCOPIC_DISCUSSION.
SPECTRAL_PURITY: 1b2_3_4_ # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns