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DOCUMENTATION_FORMAT: MIXTURE
SAMPLE_ID: BR93-34C
MIXTURE_TYPE: Coating
MIXTURE: Hematite and Quartzite
FORMULA: Fe2O3 and SiO2
FORMULA_HTML: Fe2O3 and SiO2
COLLECTION_LOCALITY: Rodman Mountains, Near Barstow, CA, USA
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
ORIGINAL_DONOR: Eric Livo
CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
SAMPLE_DESCRIPTION:
Strong coating of hematite on a muscovite bearing quartzite (The spectral measurement is principally of the hematite coating, not the underlying rock).
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
Major: Quartz Minor: Hematite Trace: Pinnoite
END_XRD_ANALYSIS.
COMPOSITIONAL_ANALYSIS_TYPE: None # XRF, EPMA, ICP(Trace), WChem
COMPOSITION_TRACE: None
COMPOSITION_DISCUSSION:
No additional compositional details available.
END_COMPOSITION_DISCUSSION.
MICROSCOPIC_EXAMINATION:
END_MICROSCOPIC_EXAMINATION.
IMAGE_OF_SAMPLE: Not Available
SPECTROSCOPIC_DISCUSSION:
Hematite spectral absorption features are seen with an intense ultraviolet-centered absorption from 0.3 to 0.55 microns, a feature at 0.66, and a strong feature at 0.88 microns. A hint of an OH absorption feature (clay or mica) is seen at 2.2 microns. This spectrum is identified as being from coarse grained hematite.
END_SPECTROSCOPIC_DISCUSSION.
SPECTRAL_PURITY: 1a2_3_4_ # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns