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DOCUMENTATION_FORMAT: Man_Made
SAMPLE_ID: GDS359
MATERIAL_TYPE: Wood
MATERIAL: Cedar Shake
FORMULA: Unknown
FORMULA_HTML: Unknown
COLLECTION_LOCALITY: Residential roof in Lakewood, Colorado
ORIGINAL_DONOR: Gregg Swayze
CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Lab
ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Lab
SAMPLE_DESCRIPTION:
Cedar shake from residential roof, collected in Lakewood, Colorado. Shake was exposed to the weather on a roof for about 5 years.
The sample was cut from a shake about 24 cm in length and 14 cm wide. The spectrum was collected of its moderately weathered surface.
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 was measured on the weathered surface of the shake. The spectrum ramps upward with a large concave absorption centered at 0.5148 microns with a longer wavelenght asbsorption edge centered at about 0.82 microns. Past 1.1 microns the spectrum has a number of spectral absorptions due to water, cellulose, and lignin. There is a strong asymmetric absorption at 1.4502 microns. A broad complex of absorptions centered at 1.74 microns is probably C-H overtone related. There are other absorptions at 1.9195, 2.0991, 2.2694, 2.3345, and 2.3838 microns. G. Swayze.
END_SPECTROSCOPIC_DISCUSSION.
SPECTRAL_PURITY: 1a2_3_4_ # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns