Spectroscopy Lab

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Comparison of the unexpanded Libby ore in transmission and reflectance.
November 6, 2017

Comparison of the unexpanded Libby ore in transmission and reflectance

Figure 19. Comparison of the continuum-removed OH-stretch-overtone region of handpicked, ground flakes of hydrobiotite from the unexpanded Libby ore in transmission and reflectance.

Figure 1. Photographs of commercial, expanded vermiculite ore from the four major historical sources.
November 6, 2017

Photographs of commercial, expanded vermiculite ore.

Figure 1. Photographs of commercial, expanded vermiculite ore from the four major historical sources: Libby, Montana; Palabora, South Africa; Louisa, Virginia; and Enoree, South Carolina. Scale of the rightmost image in each set is the same as the left image unless otherwise labeled. Note (k) shows Libby vermiculite insulation with admixed cellulose whereas (l) shows

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Continuum-removed absorbance spectra.
November 6, 2017

Continuum-removed absorbance spectra.

Figure 20. (a) Continuum-removed absorbance spectra of the NIR combination region for unexpanded and expanded vermiculite ore samples from Enoree, South Carolina (same samples as used in Fig. 19), with their deconvolution into symmetrical Gaussians. (b) Continuum-removed reflectance spectra of the same samples in the same spectral region. Both sample containers were

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Mine sources of expanded vermiculite ore samples.
November 6, 2017

Mine sources of expanded vermiculite ore samples.

Figure 21. Mine sources of expanded vermiculite ore samples based on the average 2.24/2.38-μm band-depth-ratio values and 2.24-μm composite absorption wavelength positions in microns.

Atomic structure model of a vermiculite.
November 6, 2017

Atomic structure model of a vermiculite.

Figure A1. Atomic structure model of a vermiculite from Santa Olalla, Teoledo Province, Spain, based on X-ray diffraction information from Arguelles et al. (2010), created using CrystalMaker® v. 10.0.4.

 Vermiculite ore provenance diagrams for the four major historical sources.
November 6, 2017

Vermiculite ore provenance diagrams.

Figure 4. Vermiculite ore provenance diagrams for the four major historical sources: (a) Libby, Montana, (b) Palabora, South Africa, (c) Louisa, Virginia, and (d) Enoree, South Carolina based on compositions from electron probe microanalysis (EPMA).

Locations of the four major historical vermiculite ore sources for the U.S. market.
November 6, 2017

Locations of the four major historical vermiculite ore sources.

Figure A3. Locations of the four major historical vermiculite ore sources (in bold) for the U.S. market including Libby, Montana; Louisa, Virginia; Enoree district, South Carolina; and Palabora, South Africa.

Box and whisker diagrams of electron probe microanalysis cation compositions
November 6, 2017

Box and whisker diagrams of electron probe microanalysis

Figure 5. Box and whisker diagrams of electron probe microanalysis cation compositions (listed in Table 2) of 4 selected unexpanded vermiculite ore samples (boxes with down-to-left diagonal lines), 28 unexpanded vermiculite ore samples (boxes with cross-hatched lines) and 43 expanded vermiculite ore samples (boxes with down-to-right diagonal lines) from the four major

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Measured values of isomer shifts and quadrupole splittings have distinctive ranges for each each valence state.
November 6, 2017

Measured values of isomer shifts and quadrupole splittings.

Figure 6. Measured values of isomer shifts and quadrupole splittings have distinctive ranges (boxes from Dyar et al., 2006) for each valence state and site occupancy of Fe in the selected vermiculite ore samples from Enoree, Libby, Louisa, and Palabora (Table 3).

Continuum-removed absorbance spectra of the expanded ALB22SC00 ore sample.
November 6, 2017

Continuum-removed absorbance spectra.

Figure A6. Continuum-removed absorbance spectra of an unexpanded Mg-vermiculite VTx-1sample from Llano, Texas, in the (a) OH stretch and (b) cation-OH bend fundamental regions showing absorptions and their deconvolution into symmetrical Gaussians.

Quantitative X-ray diffraction analyses of selected unexpanded vermiculite ore samples.
November 6, 2017

Quantitative X-ray diffraction analyses

Figure 7. Quantitative X-ray diffraction analyses of selected unexpanded vermiculite ore samples.