DOCUMENTATION_FORMAT: Man_Made
SAMPLE_ID: GDS358
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:
The sample was cut from a slightly weathered cedar roofing shake about 24 cm in length and 14 cm wide. The spectrum was collected of its slightly weathered surface. Approximate weathering time in the outdoors environment in Lakewood, Colorado was several months.
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:
A strong absorption edge located at 0.74 microns gives the shake its golden brown color. From about 1.1 micron into the near infrared, there are a number of absorptions due to water, lignin, and cellulose typical of wood. 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