|
DOCUMENTATION_FORMAT: Man_Made
SAMPLE_ID: GDS366
MATERIAL_TYPE: Asphalt
MATERIAL: Asphalt Shingle
FORMULA: Unknown
FORMULA_HTML: Unknown
COLLECTION_LOCALITY: Purchased at a hardware store in Denver, Colorado
ORIGINAL_DONOR: Gregg Swayze
CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Lab
ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Lab
SAMPLE_DESCRIPTION:
A single new tan colored asphalt shingle typical of the type on residential houses.
IMAGE_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 measured on upper surface of shingle (side that would be exposed to the weather had this shingle been installed on a roof). The spectrum has a strong absorption edge centered at 0.5 microns. The spectrum peaks at about 0.7 microns and then ramps toward lower reflectance at longer wavelengths with a broad absorption centered at 1.202 microns. There is a weak absorption at 1.4198 microns. Spectral features at 1.7256 and 1.7669 microns are C-H stretches. There is a strong absorption centered at 1.9131 microns. A doublet absorption in the 2.2 micron region slightly resembles kaolinite and is likely due to crushed fine aggregate that coats the top of the shingle. Bands at 2.3068 and 2.3488 microns are C-H combination bands.
END_SPECTROSCOPIC_DISCUSSION.
SPECTRAL_PURITY: 1a2_3_4_ # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns