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DOCUMENTATION_FORMAT: Man_Made
SAMPLE_ID: GDS360
MATERIAL_TYPE: Wood
MATERIAL: Cedar shake
FORMULA: Unknown
FORMULA_HTML: Unknown
COLLECTION_LOCALITY: Denver, 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 15 years.
The sample is about 44 cm in length and 8 cm in width. Its highly (H) weathered surface is slightly moss covered.
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:
The spectrum was measured on the shake's slightly moss covered, weathered surface. The spectrum ramps up from the visible to 1.9 microns with an absorption at 0.68 microns suggestive of chlorophyll or other pigment. The absorption edge is centered about 1.0 microns. The slight sharp step at 1.0 microns is an instrument artifact caused by measuring a spatially heterogenous surface. Past 1.9 microns the spectrum has absorptions due to water, cellulose, and lignin. 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