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(For further information on spectrsocopy, 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 et al., Environme ntal 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 cement debris from the World Trade Center Tower 1. Cement sample is covered in gypsum from WTC debris. It should also be noted that cement does contain small amounts of gypsum as well.
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.= |
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