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.
Dioctahedral
Smectites:
Montmorillonite SWy-1
Beidellite SBId-1
Nontronite NAu-1 |
Trioctahedral
Smectites:
Hectorite SHCa-1
Saponite SpNv-1
|
Illite/Illite-Smectite Group:
Illite IMt-1
Illite-Smectite
ISMt-1
|
Kaolinite
Group:
Kaolinite KGa-1
Halloysite HWw-1 |
Serpentine
Group:
Serpentine BUR-1690 (Antigorite) |
Other:
Cronstedtite 112792
|
Icarus 192, 605-622