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DOCUMENTATION_FORMAT: Man_Made
SAMPLE_ID: GDS368
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 light gray 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 0.38 microns. There are two absorptions in the visible at 0.4725 and 0.6080 microns that create a peak in reflectance at 0.56 microns. The spectrum peaks at about 0.75 microns and then ramps toward lower reflectance at longer wavelengths. There is a weak absorption at 1.4153 microns. An absorption at 2.2136 microns resembles that of montmorillonite or muscovite and is likely due to crushed fine aggregate that coats the top of the shingle. Bands at 2.3499 and 2.4591 microns may also be due to the crushed aggregate coating.
END_SPECTROSCOPIC_DISCUSSION.
SPECTRAL_PURITY: 1a2_3_4_ # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns