Swayze, Gregg A.
20180124
Mössbauer Spectral Data of Vermiculite Ore
CSV
Denver, CO
U.S. Geological Survey
https://doi.org/10.5066/F7JM27SR
Gregg, Swayze A.
Lowers, Heather A.
Benzel, William M.
Clark, Roger N.
Driscoll, Rhonda L.
Perlman, Zac S.
Hoefen, Todd M.
Dyar, M. Darby
2018
Characterizing the source of potentially asbestos-bearing commercial vermiculite insulation using in situ IR spectroscopy
Report
Washington, D.C.
American Mineralogist
http://doi.org/10.2138/am-2018-6022
Data are provide for four samples of unexpanded vermiculite ore from mines near Enoree, South Carolina; Libby, Montana; Louisa, Virginia; Palabora, and South Africa. ASCII text files listings of Mossbauer data for each sample are provided in comma-separated by value (csv) files. These files have the file naming structure sampleid_mossbauer_spectra.csv, where sampleid is a unique alphanumeric code for each sample. These samples were chosen as representative of the ores from their various mine sources, having documentation verifying that they were collected directly from their sources.
Data were obtained to develop an in situ spectral technique to identify the provenance (e.g., source) for use by inspectors and laboratories for identifying potentially asbestos-bearing vermiculite insulation in buildings and homes.
2000
2016
ground condition
Not planned
-128.7597656235
-62.490234376141
49.922653763102
23.684373489276
none
Vermiculite insulation
expanded vermiculite
reflectance spectroscopy
elongate amphiboles
Libby
provenance
VSPEC technique
electron probe microanalysis
spectroscopy
Crustal Geophysics and Geochemistry Science Center
CGGSC
Central Minerals and Environmental Resources Science Center
CMERSC
Mineral Resources Program
MRP
ISO 19115 Topic Categories
geoscientificInformation
environment
USGS Thesaurus
scanning electron microscopy
electron probe microanalysis
chemical analysis
mineralogy
x-ray diffraction
mineral deposits
USGS Metadata Identifier
USGS:586d310de4b0f5ce109faa4b
Geographic Names Information System (GNIS)
Enoree
South Carolina
Libby
Montana
Louisa
Virginia
GEOnet Names Server (GNS)
Palabora
South Africa
Jiangsu
China
none
There is no guarantee concerning the accuracy of the data. Any user who modifies the data is obligated to describe the types of modifications they perform. Data have been checked to ensure the accuracy. If any errors are detected, please notify the originating office. The U.S. Geological Survey strongly recommends that careful attention be paid to the metadata file associated with these data. Acknowledgment of the U.S. Geological Survey would be appreciated in products derived from these data. User specifically agrees not to misrepresent the data, nor to imply that changes made were approved or endorsed by the U.S. Geological Survey. Please refer to http://www.usgs.gov/privacy.html for the USGS disclaimer.
Gregg Swayze
U.S. Geological Survey
mailing and physical
Bldg 20, PO Box 25046, MS 964, Denver Federal Center
Denver
CO
80225
USA
303-236-0925
gswayze@usgs.gov
This release of the dataset was funded by the U.S. Geological Survey Mineral Resources Program (MRP).
No formal attribute accuracy tests were conducted
No formal logical accuracy tests were conducted
Data set is considered complete for the information presented, as described in the abstract. Users are advised to read the rest of the metadata record carefully for additional details.
No formal positional accuracy tests were conducted
No formal positional accuracy tests were conducted
Lowers, H.A., and Meeker, G.P.
2004
Electron probe microanalysis as a tool for identifying vermiculite sources
Table
Cambridge University Press
Microscopy Society of America
https://www.sciencebase.gov/catalog/item/505a08a9e4b0c8380cd51bf7
Electron Probe MicroAnalysis
20040101
20041231
20161221
EPMA
Helped determine the origin of expanded vermiculite samples
For Mössbauer analysis approximately 10 to 30 mg of each of the four selected vermiculite ore samples were ground and mixed with powdered sugar, and then gently packed into washershaped sampleholders confined by cellophane tape to minimize preferred orientation. Mössbauer spectra were acquired at 295 K using a source of 100 to 60 mCi 57Co in Rh on a WEB Research Co. model WT302® spectrometer at Mount Holyoke College in Massachusetts. For each sample, the fraction of the baseline due to the Compton scattering of 122 keV gamma rays by electrons inside the detector was subtracted. Run times were 6 to 24 hours and baseline counts ranged from ~1 to 8 million after the Compton correction. Spectra were collected in 1024 channels and corrected for nonlinearity via interpolation to a linearvelocity scale, which is defined by the spectrum of the 25 mm Fe foil used for calibration. Mössbauer data were fit using Mexfieldd, a program provided by E. De Grave from the University of Ghent, Belgium. This program solves the full hyperfine interaction Hamiltonian to fit Lorentzian doublets to the spectral data with isomer shift (IS), quadrupole splitting (QS), and full width at half maximum (FWHM) as free parameters.
2016
Sample collection from source mines has documentation.
vermiculite_ore_sampleid_mössbauer_spectra
Mössbauer spectra for select vermiculite ore samples
U.S. Geological Survey
Velocity
Velocity of the Mössbauer source moving toward and away from the sample.
U.S. Geological Survey
-4.4029
4.622
millimeter per second
Data
Percent absorption of gamma ray counts on the detector.
U.S. Geological Survey
89.896
100.182
Absorption percent
Fit_envelope
Modeled fit to entire spectrum, which is the sum of all the doublets.
U.S. Geological Survey
89.679
99.968
Absorption percent
Doublet_1
Deconvolution of doublet 1
U.S. Geological Survey
97.002
100
Absorption percent
Doublet_2
Deconvolution of doublet 2
U.S. Geological Survey
90.541
99.971
Absorption percent
Doublet_3
Deconvolution of doublet 3
U.S. Geological Survey
99.396
100
Absorption percent
Doublet_4
Deconvolution of doublet 4
U.S. Geological Survey
97.02
99.998
Absorption percent
U.S. Geological Survey – ScienceBase
U.S. Geological Survey – ScienceBase
mailing and physical
Building 810, Mail Stop 302, Denver Federal Center
Denver
CO
80225
USA
1-888-275-8747
sciencebase@usgs.gov
Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty.
20200929
Swayze, Gregg A.
U.S. Geological Survey
Research Geophysicist
mailing and physical
Bldg 20, PO Box 25046, MS 964, Denver Federal Center
Denver
CO
80225
USA
303-236-0925
gswayze@usgs.gov
Content Standard for Digital Geospatial Metadata
FGDC-STD-001-1998