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(For further information on spectroscopy, see:
http://speclab.cr.usgs.gov)
TITLE: Cement WTC01-37A DESCRIPT
DOCUMENTATION_FORMAT: Man_Made
SAMPLE_ID: WTC01-37A
MATERIAL_TYPE: Cement + Gypsum
MATERIAL: Cement + Gypsum
FORMULA: CaSO4*2H2O (Gypsum)
FORMULA_HTML: CaSO4•2H2O (Gypsum)
COLLECTION_LOCALITY: Fifty meters west of the debris pile created from collapse of the World Trade Center tower 1 on September 18th, 2001.
See: Roger N. Clark and others, Environmental Studies of the World Trade Center area after the September 11, 2001 attack, U.S. Geological Survey Open File Report OFR-01-0429. This report is available at http://pubs.usgs.gov/of/2001/ofr-01-0429/
ORIGINAL_DONOR: Todd Hoefen and Gregg Swayze
CURRENT_SAMPLE_LOCATION: USGS Denver Sample Archive Bld. 20 Denver Federal Center
ULTIMATE_SAMPLE_LOCATION: USGS Denver Sample Archive Bld. 20 Denver Federal Center
SAMPLE_DESCRIPTION:
Sample of concrete debris from the World Trade Center Tower 1. Concrete sample is covered in gypsum from WTC debris. It should also be noted that concrete in general can contain small amounts of gypsum although this particular sample appears not to contain any according to the XRD analysis.
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
Quartz (major), albite (major), portlandite (minor), magnesiohornblende (minor), orthoclase (trace), muscovite (trace).
END_XRD_ANALYSIS.
COMPOSITIONAL_ANALYSIS_TYPE: None # XRF, EM(WDS), ICP(Trace), WChem
COMPOSITION_TRACE: None
COMPOSITION_DISCUSSION:
END_COMPOSITION_DISCUSSION.
MICROSCOPIC_EXAMINATION:
END_MICROSCOPIC_EXAMINATION.
SPECTROSCOPIC_DISCUSSION:
The spectrum is dominated by gypsum absorption features at 1.45, 1.75, 1.94, 2.21, and 2.27 microns. Spectrum labeled WTC01-37Ac is of the sample exterior.
END_SPECTROSCOPIC_DISCUSSION.
SPECTRAL_PURITY: 1a2_3_4_ # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns
| LIB_SPECTRA_HED: | where | Wave Range | Av_Rs_Pwr | Comment |
|---|---|---|---|---|
| LIB_SPECTRA: | splib05a r 9797 | 0.2-3.0µm | 200 | g.s.= |
| LIB_SPECTRA: | splib06a r 27883 | g.s.= |