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DOCUMENTATION_FORMAT: Man_Made
SAMPLE_ID: GDS376
MATERIAL_TYPE: Asphalt
MATERIAL: Road Asphalt
FORMULA: Unknown
FORMULA_HTML: Unknown
COLLECTION_LOCALITY: Denver, Colorado, USA
ORIGINAL_DONOR: Gregg Swayze
CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Lab
ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Lab
SAMPLE_DESCRIPTION:
Weathered surface of a chunk of black road asphalt. Gravel is composed of quartz and feldspars. Surface color of asphalt is lighter than interior of sample.
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
END_XRD_ANALYSIS.
COMPOSITIONAL_ANALYSIS_TYPE: NONE # XRF, EPMA, ICP(Trace),WChem
COMPOSITION_TRACE: None
COMPOSITION_DISCUSSION:
END_COMPOSITION_DISCUSSION.
MICROSCOPIC_EXAMINATION:
END_MICROSCOPIC_EXAMINATION.
SPECTROSCOPIC_DISCUSSION:
Spectrum taken on weathered surface. Spectrum curves upward to higher reflectance at longer wavelengths. There are weak absorptions at 1.41, 1.73, 2.20, 2.31, and 2.35 microns. The absorption at 2.20 microns is probably due to trace amounts of kaolinite or another clay or mica. Bands at 1.73, 2.31, and 2.35 are probably C-H related absorptions.
END_SPECTROSCOPIC_DISCUSSION.
SPECTRAL_PURITY: 1a2_3_4_ # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns