Spectroscopy Lab

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

Mine sources of expanded vermiculite ore samples.

Figure A14. Same as Figure 18 with band-depth-ratio values of a few expanded vermiculite ore samples derived from spectra measured at finer spectral resolution (6 nm) then convolved to the sampling and bandpasses of the normal resolution (11 nm).

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Continuum-removed absorbance spectra of selected unexpanded and representative vermiculite ores.
November 6, 2017

Continuum-removed absorbance spectra.

Figure 15. (a) Continuum-removed absorbance spectra of selected unexpanded vermiculite ores from Enoree, Libby, Louisa, and Palabora showing the OH stretch fundamental absorptions and their deconvolution into symmetrical Gaussians. (b) Continuum-removed absorbance spectra of representative expanded vermiculite ores from the same sources.

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

Mine sources of expanded vermiculite ore samples

Figure A15. Same as Figure 21 with 2.24/2.38-μm band depth ratio and 2.24-μm absorption wavelength position values of a few expanded vermiculite ore samples derived from spectra measured at finer spectral resolution (6 nm) then convolved to the sampling and bandpasses of the normal resolution (11 nm).

Average 1.40/1.42 – 1.38/2.32-μm band-depth-ratio values of commercial expanded vermiculite ore samples.
November 6, 2017

Average band-depth-ratio values of expanded vermiculite ore.

Figure 16. Average 1.40/1.42 – 1.38/2.32-μm band-depth-ratio values of commercial expanded vermiculite ore samples used to determine their mine sources.

Bluish-gray elongate amphibole bundles found in samples of commercial expanded vermiculite ore from Libby.
May 5, 2013

Bluish-gray elongate amphibole bundles found in samples.

Figure 2. Bluish-gray elongate amphibole bundles found in samples of commercial expanded vermiculite ore from Libby.

 Figure 3.   Secondary electron images of elongate amphibole bundles from the sink fractions of commercial expanded vermiculite
May 5, 2012

Secondary electron images of elongate amphibole bundles.

Figure 3. Secondary electron images of elongate amphibole bundles from the sink fractions of commercial expanded vermiculite ore.

USGS CoreCast
September 23, 2009

Water on the Moon

Interview with USGS scientist Dr. Roger Clark about his Sept. 24 Science article that suggests water exists on the moon. Imaging spectroscopy led Clark and others to this discovery which opens the possibilities into further moon exploration.