Mid-Infrared
(5-100 μm) Reflectance Spectra and Optical Constants of Ten
Phyllosilicate
Minerals
Timothy
D. Glotch
Jet
Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91125
George R. Rossman, Oded Aharonson
Division of Geological and Planetary Sciences
California
Institute of Technology, Pasadena,
CA 91125
Abstract
We have derived
the real and imaginary indices of refraction for 10 phyllosilicate
minerals—montmorillonite, beidellite, nontronite, hectorite, saponite, illite,
illite-smectite (60/40 interlayered) kaolinite, halloysite, and serpentine—from
100-2000 cm-1 (5-100 μm) at 2 cm-1 spectral sampling
using classical Lorentz-Lorenz dispersion theory. We present the real and
imaginary indices, and the oscillator parameters with which they were modeled.
Use of these optical constants will aid in the modeling of thermal infrared
spectra of planets, asteroids, interplanetary and interstellar dust, and
protoplanetary disks around nearby stars.
Data Files from the paper:
Dioctahedral Smectites:
Montmorillonite SWy-1 Updated
10/9/06
Beidellite SBId-1 Updated
10/19/06
Nontronite NAu-1 Updated
10/26/06
Trioctahedral Smectites:
Hectorite SHCa-1
Updated 10/19/06
Saponite SpNv-1
Updated 10/9/06
Illite/Illite-Smectite Group:
Illite IMt-1
Updated 10/31/06
Illite-Smectite ISMt-1 Updated
10/31/06
Kaolinite Group:
Kaolinite KGa-1 Updated
10/9/06
Halloysite HWw-1 Updated
10/26/06
Serpentine Group:
Serpentine BUR-1690 (Antigorite)
Updated 10/9/06
Other:
Cronstedtite 112792
Updated 10/9/06 Sample not well characterized--use with
caution!
Icarus 192, 605-622